# Professional services firms headquartered in Massachusetts

Tamtam tracks 249 professional services firms headquartered in Massachusetts. This list ranks the 50 largest by number of employees on LinkedIn, led by Boston Consulting Group (BCG), Publicis Sapient and Bain & Company. Their median headcount is 1,916. Half of them were founded in 1986 or later. The most common headquarters are Boston (23), Waltham (5) and Cambridge (3).

These Massachusetts professional services firms are mostly large, established companies in business consulting, IT services, and specialized fields. Boston Consulting Group, Bain & Company, and L.E.K. Consulting are prominent global management consultancies. Publicis Sapient and Virtusa offer digital engineering and IT consulting. PPD specializes in clinical development services for drug innovation, while CDM Smith provides civil engineering solutions.

A clear pattern is the concentration of headquarters in Boston, indicating a central hub for professional services. Other significant locations include Waltham, Southborough, and Marlborough. The firms represent a mix of sectors, from market intelligence with IDC to legal services with Goodwin, and translation with Lionbridge.

🇺🇸 Massachusetts · 50 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [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 |
| 2 | [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 |  |
| 3 | [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 |  |
| 4 | [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 |  |
| 5 | [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 |
| 6 | [CDM Smith](https://www.tamtam.ai/c/cdm-smith) (cdmsmith.com)<br>This company provides comprehensive solutions in water, environment, transportation, energy, and facilities to worldwide public and private clients | Civil Engineering | 🇺🇸 Boston | 8,617 | 1947 |
| 7 | [IDC](https://www.tamtam.ai/c/idc) (idc.com)<br>Provider of market intelligence, advisory services, and events for IT, telecommunications, and consumer technology markets worldwide, helping businesses make informed decisions | Technology, Information and Internet | 🇺🇸 Boston | 5,917 | 1964 |
| 8 | [Lionbridge](https://www.tamtam.ai/c/lionbridge) (lionbridge.com)<br>This company specializes in translation and localization services in over 350 languages, connecting global brands with customers worldwide through cultural experiences | Translation and Localization | 🇺🇸 Waltham | 5,583 | 1996 |
| 9 | [L.E.K. Consulting](https://www.tamtam.ai/c/l-e-k-consulting) (lek.com)<br>Global management consulting firm providing deep industry expertise and rigorous analysis to help business leaders improve performance and create greater shareholder returns. | Business Consulting and Services | 🇺🇸 Boston | 4,271 | 1983 |
| 10 | [Quantiphi](https://www.tamtam.ai/c/quantiphi) (quantiphi.com)<br>An AI-first digital engineering company that solves complex business problems with industry experience, cloud, data engineering, and cutting-edge AI research | IT Services and IT Consulting | 🇺🇸 Marlborough | 4,105 | 2013 |
| 11 | [Aquent](https://www.tamtam.ai/c/aquent) (aquent.com)<br>Global work solutions company providing talent, technology, and services for businesses through recruiting, creative strategy, project management, and more | Staffing and Recruiting | 🇺🇸 Boston | 4,071 |  |
| 12 | [Goodwin](https://www.tamtam.ai/c/goodwin) (goodwinlaw.com)<br>Global law firm providing litigation, regulatory compliance, advisory services, and complex transactions for clients in diverse industries worldwide. | Law Practice | 🇺🇸 Boston | 3,975 | 1912 |
| 13 | [Sapient](https://www.tamtam.ai/c/sapient) (linkedin.com)<br>Global digital business transformation partner formed from a merger of legendary brands in 2019, previously known by a different name Join our LinkedIn community! | IT Services and IT Consulting | 🇺🇸 Boston | 3,549 | 1990 |
| 14 | [JSI](https://www.tamtam.ai/c/jsi-boston) (jsi.org)<br>Support underserved communities worldwide through health management consulting, research, training, and capacity building for effective public health solutions. | Non-profit Organizations | 🇺🇸 Boston | 3,272 | 1978 |
| 15 | [Beacon Hill](https://www.tamtam.ai/c/beacon-hill) (bhsg.com)<br>Provides direct hire, executive search, contract consulting, and temporary staffing solutions across multiple industries including legal, technology, financial, and life sciences sectors. | Business Consulting and Services | 🇺🇸 Boston | 3,125 | 2000 |
| 16 | [Draper](https://www.tamtam.ai/c/draper) (draper.com)<br>A nonprofit engineering innovation company advancing technologies for national security through collaboration with government, academia, and industry to solve complex challenges | Defense and Space Manufacturing | 🇺🇸 Cambridge | 2,932 |  |
| 17 | [Viant Medical](https://www.tamtam.ai/c/viant-medical) (viantmedical.com)<br>Global provider of design and manufacturing services for medical devices across various specialties, offering end-to-end capabilities from development to packaging. | Medical Equipment Manufacturing | 🇺🇸 Foxborough | 2,921 |  |
| 18 | [Oxford Global Resources](https://www.tamtam.ai/c/oxford-global-resources) (oxfordcorp.com)<br>Delivering tailored solutions for technical challenges with staffing, consulting, and project management services globally, specializing in workforce mobilization and digital transformation | Professional Services | 🇺🇸 Beverly | 2,879 |  |
| 19 | [VHB](https://www.tamtam.ai/c/vhb) (vhb.com)<br>A diverse team of professionals dedicated to improving mobility, enhancing communities, and delivering sustainable solutions for a more resilient future | Civil Engineering | 🇺🇸 Watertown | 2,812 | 1979 |
| 20 | [Public Consulting Group](https://www.tamtam.ai/c/public-consulting-group) (publicconsultinggroup.com)<br>Consulting firm specializing in public sector solutions, improving health, education, and human services agencies to enhance community outcomes. | Professional Services | 🇺🇸 Boston | 2,714 | 1986 |
| 21 | [Digitas North America](https://www.tamtam.ai/c/digitas-north-america) (digitas.com)<br>Creation of magnetic brand experiences using data, technology, creative, media, and strategy to deliver integrated marketing solutions globally. | Advertising Services | 🇺🇸 Boston | 2,628 | 1980 |
| 22 | [Management Sciences for Health](https://www.tamtam.ai/c/management-sciences-for-health) (msh.org)<br>Health organization partnering globally to strengthen health systems and improve access to quality care for vulnerable populations through local solutions and sustainable practices | Non-profit Organizations | 🇺🇸 Medford | 2,119 | 1971 |
| 23 | [Thrive](https://www.tamtam.ai/c/thrive-foxborough) (thrivenextgen.com)<br>Empowering small and mid-market organizations to transform their technology into a strategic advantage, offering AI, cybersecurity, cloud, and MSP/MSSP solutions for innovation and growth. | IT Services and IT Consulting | 🇺🇸 Foxborough | 2,059 | 2000 |
| 24 | [BCG X](https://www.tamtam.ai/c/bcg-x) (bcg.com)<br>Builds and designs platforms and software with advanced tech knowledge and entrepreneurship to enable innovation and address challenges for organizations. | Technology, Information and Internet | 🇺🇸 Boston | 2,033 |  |
| 25 | [ECI](https://www.tamtam.ai/c/eci) (eci.com)<br>A global leader in technology solutions for the financial industry, empowering organizations worldwide to achieve new performance levels through innovative technology With offices globally | IT Services and IT Consulting | 🇺🇸 Boston | 1,916 | 1995 |
| 26 | [Nixon Peabody LLP](https://www.tamtam.ai/c/nixon-peabody-llp) (nixonpeabody.com)<br>A top-100 law firm with 15 offices globally, specializing in exceptional client service, collaboration, diversity, and community engagement | Law Practice | 🇺🇸 Boston | 1,900 | 1875 |
| 27 | [Barton Associates](https://www.tamtam.ai/c/barton-associates) (bartonassociates.com)<br>Locum tenens staffing and recruiting firm, matching healthcare providers with facilities nationwide Specializing in physicians, dentists, nurse practitioners, and physician assistants | Staffing and Recruiting | 🇺🇸 Peabody | 1,897 | 2001 |
| 28 | [Analysis Group](https://www.tamtam.ai/c/analysis-group) (analysisgroup.com)<br>Provides economics, finance, healthcare analytics, and strategy expertise to law firms, Fortune 500 companies, and government agencies globally. | Business Consulting and Services | 🇺🇸 Boston | 1,848 | 1981 |
| 29 | [Trinity Life Sciences](https://www.tamtam.ai/c/trinity-life-sciences) (trinitylifesciences.com)<br>Trusted strategic partner offering evidence-based solutions for life sciences Specializing in benchmarking solutions, data-driven insights, and exceptional service for over 25 years | Business Consulting and Services | 🇺🇸 Waltham | 1,701 | 1996 |
| 30 | [Forrester](https://www.tamtam.ai/c/forrester) (forrester.com)<br>Provides research, consulting, and events to help leaders use customer-focused insights and data to drive growth and navigate change. | Research Services | 🇺🇸 Cambridge | 1,653 | 1983 |
| 31 | [Motion Recruitment Partners LLC](https://www.tamtam.ai/c/motion-recruitment-partners-llc) (motionrp.com)<br>Global talent solutions provider offering IT staffing, consulting, telecom talent solutions, RPO/MSP services, and government IT subcontracting through its various sub-brands | Staffing and Recruiting | 🇺🇸 Boston | 1,639 | 1989 |
| 32 | [Cytel](https://www.tamtam.ai/c/cytel) (cytel.com)<br>Global expertise in consulting, data-driven analytics, and software solutions for biotech and pharma companies to make confident, data-driven decisions in life sciences | Pharmaceutical Manufacturing | 🇺🇸 Cambridge | 1,625 | 1987 |
| 33 | [GEI Consultants, Inc.](https://www.tamtam.ai/c/gei-consultants-inc) (geiconsultants.com)<br>A leading firm in geotechnical, environmental, water resources, and ecological science/engineering, providing innovative solutions on projects across the globe | Civil Engineering | 🇺🇸 Woburn | 1,593 | 1970 |
| 34 | [PSG](https://www.tamtam.ai/c/psg) (psgequity.com)<br>An experienced growth equity firm partnering with software and tech-enabled services companies to drive transformational growth, strategic opportunities, and team building | Financial Services | 🇺🇸 Boston | 1,589 | 2014 |
| 35 | [Motion Recruitment](https://www.tamtam.ai/c/motion-recruitment) (motionrecruitment.com)<br>An IT talent solutions provider offering recruiting, consulting, and community events to tech enthusiasts across North America | Staffing and Recruiting | 🇺🇸 Boston | 1,550 | 1989 |
| 36 | [Mintz](https://www.tamtam.ai/c/mintz) (mintz.com)<br>A full-service law firm with over 600 attorneys, specializing in transactional, intellectual property, litigation, and regulatory legal services for clients globally | Law Practice | 🇺🇸 Boston | 1,542 | 1933 |
| 37 | [Fish & Richardson P.C.](https://www.tamtam.ai/c/fish-and-richardson-p-c) (fr.com)<br>Specializes in intellectual property law with extensive experience in patent litigation, prosecution, and post-grant proceedings across multiple venues. | Law Practice | 🇺🇸 Boston | 1,520 | 1878 |
| 38 | [Ameresco](https://www.tamtam.ai/c/ameresco) (ameresco.com)<br>An independent company specializing in energy efficiency and renewable energy solutions for public & private entities in North America and the UK | Services for Renewable Energy | 🇺🇸 Framingham | 1,475 | 2000 |
| 39 | [Lionbridge Technologies](https://www.tamtam.ai/c/lionbridge-technologies) (lionbridge.com)<br>A global leader in translation, localization, development, and testing services for international businesses, ensuring cultural & language preferences are met | Translation and Localization | 🇺🇸 Waltham | 1,463 | 1996 |
| 40 | [Jack Morton Worldwide](https://www.tamtam.ai/c/jack-morton-worldwide) (jackmorton.com)<br>Global agency specializing in event marketing, integrated campaigns, sponsorship, and employee engagement through multi-channel experiential technology, trade show exhibits, and broadcast design services. | Advertising Services | 🇺🇸 Boston | 1,414 | 1939 |
| 41 | [Apps Associates](https://www.tamtam.ai/c/apps-associates) (appsassociates.com)<br>Enterprise application services leader specializing in digital transformation initiatives, providing strategic counsel, system integration, and services to solve complex business challenges | IT Services and IT Consulting | 🇺🇸 Acton | 1,399 | 2002 |
| 42 | [Odyssey](https://www.tamtam.ai/c/odyssey-wakefield) (odysseyconsult.com)<br>An established provider of management, analytical, and technical support services for government and private sectors, offering innovative solutions to complex challenges | Government Administration | 🇺🇸 Wakefield | 1,377 | 1997 |
| 43 | [ALKU](https://www.tamtam.ai/c/alku) (alku.com)<br>Specialized consulting firm deploying skilled resources in Technologies, HCIT, Life Sciences, and Government Programs Emphasis on efficiency, accuracy, recruitment, and employee success | Staffing and Recruiting | 🇺🇸 Andover | 1,321 | 2008 |
| 44 | [Haley & Aldrich](https://www.tamtam.ai/c/haley-and-aldrich) (haleyaldrich.com)<br>A multidisciplinary team of experts committed to delivering value in capital, operations, and environmental projects through creative collaboration and efficient solutions | Environmental Services | 🇺🇸 Burlington | 1,224 | 1957 |
| 45 | [MRCC](https://www.tamtam.ai/c/mrcc) (mrccgroup.com)<br>A constantly evolving IT services company offering expertise in IT staffing, talent transformation, eLearning, application development, QA, EDM, and Oracle solutions to empower businesses | IT Services and IT Consulting | 🇺🇸 Bedford | 1,190 | 1996 |
| 46 | [CFGI](https://www.tamtam.ai/c/cfgi) (cfgi.com)<br>Global accounting firm providing technical accounting, capital markets, tax, ESG, and transaction advisory services through former Big 4 professionals without auditor independence restrictions. | Business Consulting and Services | 🇺🇸 Boston | 1,109 | 2000 |
| 47 | [ERG](https://www.tamtam.ai/c/erg) (erg.com)<br>Multidisciplinary consulting firm providing professional services to public and private clients including government agencies, corporations, and universities nationwide. | Business Consulting and Services | 🇺🇸 Concord | 1,045 | 1984 |
| 48 | [Eliassen Group](https://www.tamtam.ai/c/eliassen-group) (eliassen.com)<br>A strategic consulting company providing business, clinical, and IT services to drive exceptional outcomes, positively impacting employees, clients, and communities | Business Consulting and Services | 🇺🇸 Reading | 1,042 |  |
| 49 | [Weston & Sampson](https://www.tamtam.ai/c/weston-and-sampson) (westonandsampson.com)<br>A multidisciplinary firm offering design, engineering, and environmental services with a focus on employee empowerment, diversity, learning culture, and impactful projects | Civil Engineering | 🇺🇸 Reading | 980 | 1899 |
| 50 | [Simpson Gumpertz & Heger (SGH)](https://www.tamtam.ai/c/simpson-gumpertz-and-heger-sgh) (sgh.com)<br>National engineering firm providing holistic advice, advanced analysis, code consulting, and research for complex structural and building enclosure challenges | Civil Engineering | 🇺🇸 Waltham | 968 | 1956 |

## 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.

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