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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).

馃嚭馃嚫 Massachusetts50 companiesUpdated Nov 11, 2026

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.

#CompanyIndustryHeadquarters EmployeesFounded
1
Boston Consulting Group (BCG)bcg.com

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 馃嚭馃嚫 Boston 40,412 1963
2
Publicis Sapientpublicissapient.com

A digital business transformation partner, specializing in strategy, product, experience, engineering, data, and delivering impactful solutions to global organizations

Business Consulting and Services 馃嚭馃嚫 Boston 24,251 n/a
3
Bain & Companybain.com

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 馃嚭馃嚫 Boston 23,729 n/a
4
PPDppd.com

Global clinical development services including laboratory testing, patient recruitment, and data analytics to accelerate drug innovation for pharma, biotech, and government organizations.

Research Services 馃嚭馃嚫 Waltham 20,440 n/a
5
Virtusavirtusa.com

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 馃嚭馃嚫 Southborough 18,045 1996
6
CDM Smithcdmsmith.com

This company provides comprehensive solutions in water, environment, transportation, energy, and facilities to worldwide public and private clients

Civil Engineering 馃嚭馃嚫 Boston 8,617 1947
7
IDCidc.com

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 馃嚭馃嚫 Boston 5,917 1964
8
Lionbridgelionbridge.com

This company specializes in translation and localization services in over 350 languages, connecting global brands with customers worldwide through cultural experiences

Translation and Localization 馃嚭馃嚫 Waltham 5,583 1996
9
L.E.K. Consultinglek.com

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 馃嚭馃嚫 Boston 4,271 1983
10
Quantiphiquantiphi.com

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 馃嚭馃嚫 Marlborough 4,105 2013
11
Aquentaquent.com

Global work solutions company providing talent, technology, and services for businesses through recruiting, creative strategy, project management, and more

Staffing and Recruiting 馃嚭馃嚫 Boston 4,071 n/a
12
Goodwingoodwinlaw.com

Global law firm providing litigation, regulatory compliance, advisory services, and complex transactions for clients in diverse industries worldwide.

Law Practice 馃嚭馃嚫 Boston 3,975 1912
13
Sapientlinkedin.com

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 馃嚭馃嚫 Boston 3,549 1990
14
JSIjsi.org

Support underserved communities worldwide through health management consulting, research, training, and capacity building for effective public health solutions.

Non-profit Organizations 馃嚭馃嚫 Boston 3,272 1978
15
Beacon Hillbhsg.com

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 馃嚭馃嚫 Boston 3,125 2000
16
Draperdraper.com

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 馃嚭馃嚫 Cambridge 2,932 n/a
17
Viant Medicalviantmedical.com

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 馃嚭馃嚫 Foxborough 2,921 n/a
18
Oxford Global Resourcesoxfordcorp.com

Delivering tailored solutions for technical challenges with staffing, consulting, and project management services globally, specializing in workforce mobilization and digital transformation

Professional Services 馃嚭馃嚫 Beverly 2,879 n/a
19
VHBvhb.com

A diverse team of professionals dedicated to improving mobility, enhancing communities, and delivering sustainable solutions for a more resilient future

Civil Engineering 馃嚭馃嚫 Watertown 2,812 1979
20
Public Consulting Grouppublicconsultinggroup.com

Consulting firm specializing in public sector solutions, improving health, education, and human services agencies to enhance community outcomes.

Professional Services 馃嚭馃嚫 Boston 2,714 1986
21
Digitas North Americadigitas.com

Creation of magnetic brand experiences using data, technology, creative, media, and strategy to deliver integrated marketing solutions globally.

Advertising Services 馃嚭馃嚫 Boston 2,628 1980
22
Management Sciences for Healthmsh.org

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 馃嚭馃嚫 Medford 2,119 1971
23
Thrivethrivenextgen.com

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 馃嚭馃嚫 Foxborough 2,059 2000
24
BCG Xbcg.com

Builds and designs platforms and software with advanced tech knowledge and entrepreneurship to enable innovation and address challenges for organizations.

Technology, Information and Internet 馃嚭馃嚫 Boston 2,033 n/a
25
ECIeci.com

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 馃嚭馃嚫 Boston 1,916 1995

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26
Nixon Peabody LLPnixonpeabody.com

A top-100 law firm with 15 offices globally, specializing in exceptional client service, collaboration, diversity, and community engagement

Law Practice 馃嚭馃嚫 Boston 1,900 1875
27
Barton Associatesbartonassociates.com

Locum tenens staffing and recruiting firm, matching healthcare providers with facilities nationwide Specializing in physicians, dentists, nurse practitioners, and physician assistants

Staffing and Recruiting 馃嚭馃嚫 Peabody 1,897 2001
28
Analysis Groupanalysisgroup.com

Provides economics, finance, healthcare analytics, and strategy expertise to law firms, Fortune 500 companies, and government agencies globally.

Business Consulting and Services 馃嚭馃嚫 Boston 1,848 1981
29
Trinity Life Sciencestrinitylifesciences.com

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 馃嚭馃嚫 Waltham 1,701 1996
30
Forresterforrester.com

Provides research, consulting, and events to help leaders use customer-focused insights and data to drive growth and navigate change.

Research Services 馃嚭馃嚫 Cambridge 1,653 1983
31
Motion Recruitment Partners LLCmotionrp.com

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 馃嚭馃嚫 Boston 1,639 1989
32
Cytelcytel.com

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 馃嚭馃嚫 Cambridge 1,625 1987
33
GEI Consultants, Inc.geiconsultants.com

A leading firm in geotechnical, environmental, water resources, and ecological science/engineering, providing innovative solutions on projects across the globe

Civil Engineering 馃嚭馃嚫 Woburn 1,593 1970
34
PSGpsgequity.com

An experienced growth equity firm partnering with software and tech-enabled services companies to drive transformational growth, strategic opportunities, and team building

Financial Services 馃嚭馃嚫 Boston 1,589 2014
35
Motion Recruitmentmotionrecruitment.com

An IT talent solutions provider offering recruiting, consulting, and community events to tech enthusiasts across North America

Staffing and Recruiting 馃嚭馃嚫 Boston 1,550 1989
36
Mintzmintz.com

A full-service law firm with over 600 attorneys, specializing in transactional, intellectual property, litigation, and regulatory legal services for clients globally

Law Practice 馃嚭馃嚫 Boston 1,542 1933
37
Fish & Richardson P.C.fr.com

Specializes in intellectual property law with extensive experience in patent litigation, prosecution, and post-grant proceedings across multiple venues.

Law Practice 馃嚭馃嚫 Boston 1,520 1878
38
Amerescoameresco.com

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 馃嚭馃嚫 Framingham 1,475 2000
39
Lionbridge Technologieslionbridge.com

A global leader in translation, localization, development, and testing services for international businesses, ensuring cultural & language preferences are met

Translation and Localization 馃嚭馃嚫 Waltham 1,463 1996
40
Jack Morton Worldwidejackmorton.com

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 馃嚭馃嚫 Boston 1,414 1939
41
Apps Associatesappsassociates.com

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 馃嚭馃嚫 Acton 1,399 2002
42
Odysseyodysseyconsult.com

An established provider of management, analytical, and technical support services for government and private sectors, offering innovative solutions to complex challenges

Government Administration 馃嚭馃嚫 Wakefield 1,377 1997
43
ALKUalku.com

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 馃嚭馃嚫 Andover 1,321 2008
44
Haley & Aldrichhaleyaldrich.com

A multidisciplinary team of experts committed to delivering value in capital, operations, and environmental projects through creative collaboration and efficient solutions

Environmental Services 馃嚭馃嚫 Burlington 1,224 1957
45
MRCCmrccgroup.com

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 馃嚭馃嚫 Bedford 1,190 1996
46
CFGIcfgi.com

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 馃嚭馃嚫 Boston 1,109 2000
47
ERGerg.com

Multidisciplinary consulting firm providing professional services to public and private clients including government agencies, corporations, and universities nationwide.

Business Consulting and Services 馃嚭馃嚫 Concord 1,045 1984
48
Eliassen Groupeliassen.com

A strategic consulting company providing business, clinical, and IT services to drive exceptional outcomes, positively impacting employees, clients, and communities

Business Consulting and Services 馃嚭馃嚫 Reading 1,042 n/a
49
Weston & Sampsonwestonandsampson.com

A multidisciplinary firm offering design, engineering, and environmental services with a focus on employee empowerment, diversity, learning culture, and impactful projects

Civil Engineering 馃嚭馃嚫 Reading 980 1899
50
Simpson Gumpertz & Heger (SGH)sgh.com

National engineering firm providing holistic advice, advanced analysis, code consulting, and research for complex structural and building enclosure challenges

Civil Engineering 馃嚭馃嚫 Waltham 968 1956

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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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