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.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 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 |
40,412 | |||
| 2 |
Publicis Sapientpublicissapient.com
A digital business transformation partner, specializing in strategy, product, experience, engineering, data, and delivering impactful solutions to global organizations |
24,251 | |||
| 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. |
23,729 | |||
| 4 | 20,440 | ||||
| 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 |
18,045 | |||
| 6 |
CDM Smithcdmsmith.com
This company provides comprehensive solutions in water, environment, transportation, energy, and facilities to worldwide public and private clients |
8,617 | |||
| 7 | 5,917 | ||||
| 8 |
Lionbridgelionbridge.com
This company specializes in translation and localization services in over 350 languages, connecting global brands with customers worldwide through cultural experiences |
5,583 | |||
| 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. |
4,271 | |||
| 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 |
4,105 | |||
| 11 |
Aquentaquent.com
Global work solutions company providing talent, technology, and services for businesses through recruiting, creative strategy, project management, and more |
4,071 | |||
| 12 |
Goodwingoodwinlaw.com
Global law firm providing litigation, regulatory compliance, advisory services, and complex transactions for clients in diverse industries worldwide. |
3,975 | |||
| 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! |
3,549 | |||
| 14 | 3,272 | ||||
| 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. |
3,125 | |||
| 16 |
Draperdraper.com
A nonprofit engineering innovation company advancing technologies for national security through collaboration with government, academia, and industry to solve complex challenges |
2,932 | |||
| 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. |
2,921 | |||
| 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 |
2,879 | |||
| 19 | 2,812 | ||||
| 20 |
Public Consulting Grouppublicconsultinggroup.com
Consulting firm specializing in public sector solutions, improving health, education, and human services agencies to enhance community outcomes. |
2,714 | |||
| 21 |
Digitas North Americadigitas.com
Creation of magnetic brand experiences using data, technology, creative, media, and strategy to deliver integrated marketing solutions globally. |
2,628 | |||
| 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 |
2,119 | |||
| 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. |
2,059 | |||
| 24 | 2,033 | ||||
| 25 | 1,916 | ||||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 26 |
Nixon Peabody LLPnixonpeabody.com
A top-100 law firm with 15 offices globally, specializing in exceptional client service, collaboration, diversity, and community engagement |
1,900 | |||
| 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 |
1,897 | |||
| 28 |
Analysis Groupanalysisgroup.com
Provides economics, finance, healthcare analytics, and strategy expertise to law firms, Fortune 500 companies, and government agencies globally. |
1,848 | |||
| 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 |
1,701 | |||
| 30 |
Forresterforrester.com
Provides research, consulting, and events to help leaders use customer-focused insights and data to drive growth and navigate change. |
1,653 | |||
| 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 |
1,639 | |||
| 32 | 1,625 | ||||
| 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 |
1,593 | |||
| 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 |
1,589 | |||
| 35 |
Motion Recruitmentmotionrecruitment.com
An IT talent solutions provider offering recruiting, consulting, and community events to tech enthusiasts across North America |
1,550 | |||
| 36 | 1,542 | ||||
| 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. |
1,520 | |||
| 38 |
Amerescoameresco.com
An independent company specializing in energy efficiency and renewable energy solutions for public & private entities in North America and the UK |
1,475 | |||
| 39 |
Lionbridge Technologieslionbridge.com
A global leader in translation, localization, development, and testing services for international businesses, ensuring cultural & language preferences are met |
1,463 | |||
| 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. |
1,414 | |||
| 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 |
1,399 | |||
| 42 |
Odysseyodysseyconsult.com
An established provider of management, analytical, and technical support services for government and private sectors, offering innovative solutions to complex challenges |
1,377 | |||
| 43 | 1,321 | ||||
| 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 |
1,224 | |||
| 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 |
1,190 | |||
| 46 | 1,109 | ||||
| 47 | 1,045 | ||||
| 48 |
Eliassen Groupeliassen.com
A strategic consulting company providing business, clinical, and IT services to drive exceptional outcomes, positively impacting employees, clients, and communities |
1,042 | |||
| 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 |
980 | |||
| 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 |
968 | |||
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Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 11, 2026.
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The same list elsewhere in United States
- Professional services firms in the United States 7,078
- Professional services firms in New York State 955
- Professional services firms in California 880
- Professional services firms in Texas 629
- Professional services firms in Florida 375
- Professional services firms in Virginia 344
- Professional services firms in Illinois 339
- Professional services firms in New Jersey 249
- Professional services firms in Georgia 246
- Professional services firms in Pennsylvania 245
- Professional services firms in Ohio 195
- Professional services firms in Maryland 176
- Professional services firms in Michigan 172
- Professional services firms in Washington State 163
- Professional services firms in North Carolina 142
- Professional services firms in Alabama 135
- Professional services firms in Minnesota 125
- Professional services firms in New York 735
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- Professional services firms in Houston 156
- Professional services firms in Atlanta 143
- Professional services firms in San Francisco 130
- Professional services firms in Washington 109
- Professional services firms in Los Angeles 108