# Professional services firms headquartered in the United States

Tamtam tracks 7,078 professional services firms headquartered in the United States. This list ranks the 100 largest by number of employees on LinkedIn, led by Deloitte, KPMG and Concentrix. Their median headcount is 21,982. Half of them were founded in 1981 or later. The most common headquarters are New York (14), Chicago (9) and Dallas (4).

This selection of professional services firms in the United States includes some of the largest global players in consulting, IT services, and real estate. Companies like Deloitte, a global professional services firm, and KPMG, offering audit, tax, and advisory services, represent the traditional consulting sector. IT services are prominent with Concentrix, which provides customer experience solutions, and Kyndryl, a leader in managing advanced technology infrastructure. JLL and CBRE specialize in real estate and investment management.

The data shows a concentration of headquarters in major US cities, particularly New York, which hosts Genpact, Goldman Sachs, Kyndryl, and WNS. Other significant hubs include Dallas, with JLL and Jacobs, and Chicago, home to JLL. The firms span a wide range of founding dates, from Deloitte (1845) and ManpowerGroup (1948) to more recent establishments like DXC Technology (2017) and Kyndryl (2021), indicating a mix of long-established enterprises and newer entities.

🇺🇸 United States · 100 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [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 |
| 2 | [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 |  |
| 3 | [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 |
| 4 | [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 |
| 5 | [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 |  |
| 6 | [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 |  |
| 7 | [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 |
| 8 | [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 |
| 9 | [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 |  |
| 10 | [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 |  |
| 11 | [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 |
| 12 | [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 |
| 13 | [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 |  |
| 14 | [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 |
| 15 | [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 |
| 16 | [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 |
| 17 | [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 |
| 18 | [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 |  |
| 19 | [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 |
| 20 | [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 |
| 21 | [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 |
| 22 | [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 |  |
| 23 | [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 |
| 24 | [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 |
| 25 | [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 |
| 26 | [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 |
| 27 | [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 |
| 28 | [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 |
| 29 | [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 |
| 30 | [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 |
| 31 | [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 |
| 32 | [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 |
| 33 | [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 |  |
| 34 | [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 |  |
| 35 | [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 |
| 36 | [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 |  |
| 37 | [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 |
| 38 | [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 |  |
| 39 | [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 |
| 40 | [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 |  |
| 41 | [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 |
| 42 | [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 |  |
| 43 | [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 |  |
| 44 | [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 |
| 45 | [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 |  |
| 46 | [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 |  |
| 47 | [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 |  |
| 48 | [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 |  |
| 49 | [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 |
| 50 | [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 |
| 51 | [Korn Ferry](https://www.tamtam.ai/c/korn-ferry) (kornferry.com)<br>It is a global consulting firm specializing in organizational design, hiring, workforce motivation, and professional development for career advancement. | Business Consulting and Services | 🇺🇸 Los Angeles | 21,328 |  |
| 52 | [Appen](https://www.tamtam.ai/c/appen) (appen.com)<br>High-quality datasets and human-in-the-loop services for training, fine-tuning, and evaluating generative AI models through a global crowd of over one million contributors. | IT Services and IT Consulting | 🇺🇸 Kirkland | 20,860 | 1996 |
| 53 | [Parsons Corporation](https://www.tamtam.ai/c/parsons-corporation) (parsons.com)<br>A digitally enabled solutions provider creating future defense, intelligence, and critical infrastructure solutions with an agile and innovative approach | Civil Engineering | 🇺🇸 Chantilly | 20,710 |  |
| 54 | [Aerotek](https://www.tamtam.ai/c/aerotek) (aerotek.com)<br>Aerotek provides staffing and services solutions for various industries, helping companies and careers evolve to overcome challenges in North American industry | Staffing and Recruiting | 🇺🇸 Hanover | 20,490 | 1983 |
| 55 | [PPD](https://www.tamtam.ai/c/ppd) (ppd.com)<br>Global clinical development services including laboratory testing, patient recruitment, and data analytics to accelerate drug innovation for pharma, biotech, and government organizations. | Research Services | 🇺🇸 Waltham | 20,440 |  |
| 56 | [CBRE Global Workplace Solutions (GWS)](https://www.tamtam.ai/c/cbre-global-workplace-solutions-gws) (cbre.com)<br>Partner with clients worldwide to deliver tailored workplace solutions addressing unique organizational needs and driving strategic business outcomes. | Real Estate | 🇺🇸 Dallas | 20,430 | 1984 |
| 57 | [Kelly](https://www.tamtam.ai/c/kelly) (kellyservices.com)<br>A pioneering staffing company connecting over 450,000 individuals with work annually, leveraging expertise in various industries since 1946 | Staffing and Recruiting | 🇺🇸 Troy | 20,231 | 1946 |
| 58 | [Amergis Healthcare Staffing](https://www.tamtam.ai/c/amergis-healthcare-staffing) (amergis.com)<br>Healthcare staffing agency offering opportunities and solutions for various healthcare professionals and organizations with a personalized approach and exceptional service | Staffing and Recruiting | 🇺🇸 Columbia | 19,829 | 1988 |
| 59 | [RSM US LLP](https://www.tamtam.ai/c/rsm-us-llp) (rsmus.com)<br>Provider of assurance, tax, and consulting services focused on middle market clients with a global presence and professional development culture. | Accounting | 🇺🇸 Chicago | 19,700 | 1926 |
| 60 | [Sagility](https://www.tamtam.ai/c/sagility) (sagility.com)<br>A global provider of technology-driven healthcare solutions, specializing in business process management, customer experience, member engagement, and analytics for positive outcomes | Operations Consulting | 🇺🇸 Atlanta | 19,592 |  |
| 61 | [Insight](https://www.tamtam.ai/c/insight) (insight.com)<br>A Fortune 500 solutions integrator specializing in accelerating digital transformation, modernizing businesses, and maximizing technology value through deep partnerships | IT Services and IT Consulting | 🇺🇸 Chandler | 19,219 | 1988 |
| 62 | [CDW](https://www.tamtam.ai/c/cdw) (cdw.com)<br>A leading IT solutions provider offering a full-stack approach with extensive services and deep industry expertise to drive innovation and achieve organizational goals | IT Services and IT Consulting | 🇺🇸 Vernon Hills | 18,732 |  |
| 63 | [Freelance (Self employed)](https://www.tamtam.ai/c/freelance-self-employed-20365453) (setmore.com)<br>Community of independent professionals, creators, and self-employed individuals helping people overcome challenges, remove bottlenecks, and focus on what truly matters. | Professional Services | 🇺🇸 | 18,205 | 2017 |
| 64 | [Virtusa](https://www.tamtam.ai/c/virtusa-southborough) (virtusa.com)<br>Digital engineering and technology services provider for Forbes Global 2000 companies worldwide, focusing on innovative solutions and impactful results through an "Engineering First" approach | IT Services and IT Consulting | 🇺🇸 Southborough | 18,045 | 1996 |
| 65 | [Infosys Ltd](https://www.tamtam.ai/c/infosys-ltd-richardson) (infosys.com)<br>Global leader in next-generation digital services and consulting, enabling clients worldwide to navigate digital transformation with AI-powered solutions and agile digital delivery for performance and customer satisfaction | IT Services and IT Consulting | 🇺🇸 Tx 75082 | 17,979 | 1981 |
| 66 | [Gi Group](https://www.tamtam.ai/c/gi-group) (gigroup.com)<br>Providing temporary, permanent, professional staffing, executive search, outsourcing, training, outplacement, and HR consultancy services worldwide across multiple industries. | Staffing and Recruiting | 🇺🇸 Milan | 17,915 |  |
| 67 | [TransPerfect](https://www.tamtam.ai/c/transperfect) (transperfect.com)<br>A global leader in language services and technologies, helping businesses expand internationally through translation, localization, multicultural marketing, interpretation, and more | Translation and Localization | 🇺🇸 New York | 17,809 | 1992 |
| 68 | [HDR](https://www.tamtam.ai/c/hdr) (hdrinc.com)<br>Employee-owned design firm offering engineering, architecture, environmental, and construction services Top-ranked globally, specializing in healthcare design with a focus on collaboration and career growth | Design Services | 🇺🇸 Omaha | 17,540 | 1917 |
| 69 | [Wipro Technologies](https://www.tamtam.ai/c/wipro-technologies-new-orleans) (wipro.com)<br>Management consulting company located in New Orleans, providing services to help businesses improve operations and achieve their goals | Business Consulting and Services | 🇺🇸 New Orleans | 16,942 |  |
| 70 | [Burns & McDonnell](https://www.tamtam.ai/c/burns-and-mcdonnell) (burnsmcd.com)<br>Engineering, construction, architecture, planning, and community engagement with a strong ownership mentality and commitment to client success and safety. | Construction | 🇺🇸 Kansas City | 16,200 |  |
| 71 | [HUB International](https://www.tamtam.ai/c/hub-international) (hubinternational.com)<br>Advises businesses and individuals on insurance, risk management, employee benefits, retirement, and wealth management with tailored solutions. | Insurance | 🇺🇸 Chicago | 16,129 |  |
| 72 | [Guidehouse](https://www.tamtam.ai/c/guidehouse) (guidehouse.com)<br>Global AI-led professional services firm providing advisory, technology, and managed services to commercial and government sectors for efficiency and resilience. | Business Consulting and Services | 🇺🇸 McLean | 15,865 |  |
| 73 | [Wells Fargo Advisors](https://www.tamtam.ai/c/wells-fargo-advisors) (wellsfargoadvisors.com)<br>Financial advisors providing professional investment guidance and wealth management services across fifty states to help clients achieve long-term success through complex planning. | Financial Services | 🇺🇸 St. Louis | 14,935 |  |
| 74 | [Lockton](https://www.tamtam.ai/c/lockton) (global.lockton.com)<br>Private ownership enabling independent focus on clients' risk and insurance needs with global expertise and remarkable results. | Insurance | 🇺🇸 Global | 14,780 | 1966 |
| 75 | [Marsh McLennan Agency](https://www.tamtam.ai/c/marsh-mclennan-agency) (marshmma.com)<br>Provides business insurance, employee health benefits, retirement planning, and private client insurance with personalized local service and global expertise. | Insurance | 🇺🇸 White Plains | 14,684 |  |
| 76 | [Synechron](https://www.tamtam.ai/c/synechron) (synechron.com)<br>Innovative consulting firm leveraging digital technology to deliver leading solutions in AI, digital, cloud, data, and software engineering for financial services and technology industries globally | Technology, Information and Internet | 🇺🇸 New York | 14,671 | 2001 |
| 77 | [UL Solutions](https://www.tamtam.ai/c/ul-solutions) (ul.com)<br>Global provider of safety testing, certification, inspection, auditing, and advisory services ensuring product security, sustainability, and market trust. | Professional Services | 🇺🇸 Northbrook | 14,487 | 1894 |
| 78 | [Express Employment International](https://www.tamtam.ai/c/express-employment-international) (expresspros.com)<br>International staffing company supporting franchise locations worldwide, providing staffing and HR services to connect individuals with jobs and businesses with employees | Staffing and Recruiting | 🇺🇸 Oklahoma City | 14,211 | 1983 |
| 79 | [PwC Acceleration Centers](https://www.tamtam.ai/c/pwc-acceleration-centers) (pwc.com)<br>Global talent hubs delivering digital, innovative, and collaborative client support across multiple countries, enhancing quality and driving new ways of working. | Professional Services | 🇺🇸 | 14,116 |  |
| 80 | [Alvarez & Marsal](https://www.tamtam.ai/c/alvarez-and-marsal) (alvarezandmarsal.com)<br>Global professional services firm specializing in business transformation, restructuring, performance improvement, and delivering practical solutions for complex organizational challenges. | Business Consulting and Services | 🇺🇸 New York | 14,064 |  |
| 81 | [Apex Systems](https://www.tamtam.ai/c/apex-systems) (apexsystems.com)<br>Specializes in strategy, transformation, managed services including application development, data, cloud, cybersecurity, and AI solutions across global markets. | IT Services and IT Consulting | 🇺🇸 Glen Allen | 13,945 | 1995 |
| 82 | [Protiviti](https://www.tamtam.ai/c/protiviti) (protiviti.com)<br>Global consulting firm offering expertise in finance, technology, operations, data, digital, legal, HR, risk, and internal audit to help clients navigate future challenges | Business Consulting and Services | 🇺🇸 Menlo Park | 13,479 | 2002 |
| 83 | [Movate](https://www.tamtam.ai/c/movate) (movate.com)<br>A digital technology and customer experience services company focused on innovation and client outcomes, with a global network of diverse talent | IT Services and IT Consulting | 🇺🇸 Plano | 13,112 | 1996 |
| 84 | [Marsh](https://www.tamtam.ai/c/marsh) (marsh.com)<br>provides risk management, strategy consulting, and people advisory services to clients worldwide across multiple specialized business units | Professional Services | 🇺🇸 New York | 12,940 |  |
| 85 | [Thoughtworks](https://www.tamtam.ai/c/thoughtworks) (thoughtworks.com)<br>A global technology consultancy specializing in strategy, design, and engineering to drive digital innovation, fostering diverse talent and a strong cultivation culture | IT Services and IT Consulting | 🇺🇸 Chicago | 12,735 |  |
| 86 | [RGIS](https://www.tamtam.ai/c/rgis) (rgis.com)<br>A global provider of accurate inventories and quality retail merchandising services, with nation-wide coverage and a passion for client satisfaction | Retail | 🇺🇸 Birmingham | 12,544 | 1958 |
| 87 | [TrueBlue Inc.](https://www.tamtam.ai/c/trueblue-inc) (trueblue.com)<br>Staffing, recruiting, and workforce management services for diverse industries, providing reliable and efficient workforce solutions daily. | Staffing and Recruiting | 🇺🇸 Tacoma | 12,447 | 1989 |
| 88 | [GLG](https://www.tamtam.ai/c/glg) (glg.com)<br>Connecting decision makers with experts for true clarity and insights to make informed decisions and stay ahead in their profession Visit website for more details | Information Services | 🇺🇸 New York | 12,228 | 1998 |
| 89 | [Dentons](https://www.tamtam.ai/c/dentons) (dentons.com)<br>Global law firm in 80+ countries offers legal solutions for clients to grow, protect, operate, and finance, emphasizing diversity, inclusion, and sustainability | Law Practice | 🇺🇸 Worldwide | 12,002 |  |
| 90 | [Baker McKenzie](https://www.tamtam.ai/c/baker-mckenzie) (bakermckenzie.com)<br>Provide practical legal advice combining local knowledge and international expertise to help businesses succeed across global markets. | Law Practice | 🇺🇸 Chicago | 11,895 |  |
| 91 | [Black & Veatch](https://www.tamtam.ai/c/black-and-veatch) (bv.com)<br>An employee-owned global leader in building critical human infrastructure in Energy, Water, Telecommunications, and Government Services since 1915 | Engineering Services | 🇺🇸 Overland Park | 11,691 | 1915 |
| 92 | [Grant Thornton (US)](https://www.tamtam.ai/c/grant-thornton-us) (grantthornton.com)<br>Provides independent audit, tax, and advisory services through a global network, focusing on quality, trust, and strong client relationships. | Professional Services | 🇺🇸 Chicago | 11,518 | 1924 |
| 93 | [Fortrea](https://www.tamtam.ai/c/fortrea) (fortrea.com)<br>A global provider of clinical development and patient access solutions, specializing in accelerating life-changing therapies to patients through innovative trial management services | Biotechnology Research | 🇺🇸 Research Triangle Park | 11,430 |  |
| 94 | [Propio Language Services](https://www.tamtam.ai/c/propio-language-services) (propio.com)<br>Providing technology-driven interpreting, translation, and localization services. Ensuring Limited English Proficient speakers access essential services through certified, ethical interpreters. | Translation and Localization | 🇺🇸 Overland Park | 11,345 | 1998 |
| 95 | [BDO USA](https://www.tamtam.ai/c/bdo-usa) (bdo.com)<br>Providing middle market leaders with assurance, tax, and advisory services focused on cultivating a people-centered, growth-oriented corporate culture. | Accounting | 🇺🇸 Chicago | 11,182 | 1910 |
| 96 | [V2X Inc](https://www.tamtam.ai/c/v2x-inc) (gov2x.com)<br>Integrated solutions across operations, logistics, aerospace, training, and technology markets for national security and international clients throughout the entire mission lifecycle. | Defense and Space Manufacturing | 🇺🇸 McLean | 11,084 |  |
| 97 | [ICF](https://www.tamtam.ai/c/icf) (icf.com)<br>Global provider combining expertise and technology to solve complex challenges, support change management, and shape future strategies for clients. | Business Consulting and Services | 🇺🇸 Reston | 10,724 | 1969 |
| 98 | [USI Insurance Services](https://www.tamtam.ai/c/usi-insurance-services) (usi.com)<br>A global insurance brokerage and consulting firm offering property & casualty, employee benefits, personal risk, and retirement solutions for businesses and individuals | Insurance | 🇺🇸 Valhalla | 10,717 | 1994 |
| 99 | [Randstad USA](https://www.tamtam.ai/c/randstad-usa) (randstadusa.com)<br>Provides staffing, recruitment, outsourcing, consulting, and workforce management solutions across various industries in the U.S. and Canada. | Staffing and Recruiting | 🇺🇸 Atlanta | 10,638 |  |
| 100 | [Baker Tilly US](https://www.tamtam.ai/c/baker-tilly-us) (bakertilly.com)<br>A leading advisory CPA firm with a coast-to-coast and global presence, part of Baker Tilly International network with 43,000 professionals | Accounting | 🇺🇸 Chicago | 10,594 |  |

## 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 11, 2026.

## More company lists in the United States

- [The largest companies in the United States](https://www.tamtam.ai/l/largest-companies-united-states) (104,974)
- [Multinational companies in the United States](https://www.tamtam.ai/l/multinational-companies-united-states) (16,197)
- [Manufacturers in the United States](https://www.tamtam.ai/l/manufacturers-united-states) (8,678)
- [Retail chains in the United States](https://www.tamtam.ai/l/retail-chains-united-states) (6,980)
- [Financial services firms in the United States](https://www.tamtam.ai/l/financial-services-firms-united-states) (6,864)
- [Companies with in-house R&D in the United States](https://www.tamtam.ai/l/r-and-d-companies-united-states) (6,796)
- [IT Services and IT Consulting companies in the United States](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-united-states) (6,694)
- [SaaS companies in the United States](https://www.tamtam.ai/l/saas-companies-united-states) (6,410)
- [IT services companies in the United States](https://www.tamtam.ai/l/it-services-companies-united-states) (5,818)
- [Healthcare providers in the United States](https://www.tamtam.ai/l/healthcare-providers-united-states) (5,810)
- [Critical infrastructure operators in the United States](https://www.tamtam.ai/l/critical-infrastructure-operators-united-states) (5,801)
- [Hospitals and Health Care companies in the United States](https://www.tamtam.ai/l/hospitals-and-health-care-companies-united-states) (5,573)
- [Hardware manufacturers in the United States](https://www.tamtam.ai/l/hardware-companies-united-states) (5,346)
- [Software Development companies in the United States](https://www.tamtam.ai/l/software-development-companies-united-states) (5,311)
- [Financial Services companies in the United States](https://www.tamtam.ai/l/financial-services-companies-united-states) (5,012)
- [Companies with a mobile app in the United States](https://www.tamtam.ai/l/companies-with-mobile-app-united-states) (4,663)
- [Consulting firms in the United States](https://www.tamtam.ai/l/consulting-firms-united-states) (4,381)
- [AI companies in the United States](https://www.tamtam.ai/l/ai-companies-united-states) (4,246)
- [Public sector organisations in the United States](https://www.tamtam.ai/l/public-sector-organisations-united-states) (4,149)
- [Subscription businesses in the United States](https://www.tamtam.ai/l/subscription-businesses-united-states) (3,923)
- [Real Estate companies in the United States](https://www.tamtam.ai/l/real-estate-companies-united-states) (3,808)
- [Higher Education companies in the United States](https://www.tamtam.ai/l/higher-education-companies-united-states) (3,470)
- [Construction companies in the United States](https://www.tamtam.ai/l/construction-companies-united-states) (3,271)
- [Publicly traded companies in the United States](https://www.tamtam.ai/l/publicly-traded-companies-united-states) (3,099)

## The same list elsewhere in United States

- [Professional services firms in New York State](https://www.tamtam.ai/l/professional-services-firms-new-york-state) (955)
- [Professional services firms in California](https://www.tamtam.ai/l/professional-services-firms-california) (880)
- [Professional services firms in Texas](https://www.tamtam.ai/l/professional-services-firms-texas) (629)
- [Professional services firms in Florida](https://www.tamtam.ai/l/professional-services-firms-florida) (375)
- [Professional services firms in Virginia](https://www.tamtam.ai/l/professional-services-firms-virginia) (344)
- [Professional services firms in Illinois](https://www.tamtam.ai/l/professional-services-firms-illinois) (339)
- [Professional services firms in Massachusetts](https://www.tamtam.ai/l/professional-services-firms-massachusetts) (249)
- [Professional services firms in New Jersey](https://www.tamtam.ai/l/professional-services-firms-new-jersey) (249)
- [Professional services firms in Georgia](https://www.tamtam.ai/l/professional-services-firms-georgia) (246)
- [Professional services firms in Pennsylvania](https://www.tamtam.ai/l/professional-services-firms-pennsylvania) (245)
- [Professional services firms in Ohio](https://www.tamtam.ai/l/professional-services-firms-ohio) (195)
- [Professional services firms in Maryland](https://www.tamtam.ai/l/professional-services-firms-maryland) (176)
- [Professional services firms in Michigan](https://www.tamtam.ai/l/professional-services-firms-michigan) (172)
- [Professional services firms in Washington State](https://www.tamtam.ai/l/professional-services-firms-washington-state) (163)
- [Professional services firms in North Carolina](https://www.tamtam.ai/l/professional-services-firms-north-carolina) (142)
- [Professional services firms in Alabama](https://www.tamtam.ai/l/professional-services-firms-alabama) (135)
- [Professional services firms in Minnesota](https://www.tamtam.ai/l/professional-services-firms-minnesota) (125)
- [Professional services firms in New York](https://www.tamtam.ai/l/professional-services-firms-new-york) (735)
- [Professional services firms in Chicago](https://www.tamtam.ai/l/professional-services-firms-chicago) (196)
- [Professional services firms in Houston](https://www.tamtam.ai/l/professional-services-firms-houston) (156)
- [Professional services firms in Atlanta](https://www.tamtam.ai/l/professional-services-firms-atlanta) (143)
- [Professional services firms in San Francisco](https://www.tamtam.ai/l/professional-services-firms-san-francisco) (130)
- [Professional services firms in Washington](https://www.tamtam.ai/l/professional-services-firms-washington) (109)
- [Professional services firms in Los Angeles](https://www.tamtam.ai/l/professional-services-firms-los-angeles) (108)

---

Source: https://www.tamtam.ai/l/professional-services-firms-united-states