These Boston-based firms specialize in professional services, encompassing a range of business consulting, technology solutions, and legal practices. The list includes large global players such as Boston Consulting Group (BCG), a global management consulting firm, and Publicis Sapient, a digital business transformation partner. Other significant firms are CDM Smith, which offers civil engineering solutions, and Goodwin, a global law firm. The companies listed are generally well-established, with many founded before the year 2000. Many of these firms, like IDC, a provider of market intelligence, and L.E.K. Consulting, a global management consulting firm, serve a worldwide client base from their Boston headquarters. This concentration of headquarters in Boston highlights the city's role as a hub for professional services that cater to both national and international markets.
| # | 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 |
CDM Smithcdmsmith.com
This company provides comprehensive solutions in water, environment, transportation, energy, and facilities to worldwide public and private clients |
8,617 | |||
| 4 | 5,917 | ||||
| 5 |
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 | |||
| 6 |
Aquentaquent.com
Global work solutions company providing talent, technology, and services for businesses through recruiting, creative strategy, project management, and more |
4,071 | |||
| 7 |
Goodwingoodwinlaw.com
Global law firm providing litigation, regulatory compliance, advisory services, and complex transactions for clients in diverse industries worldwide. |
3,975 | |||
| 8 |
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 | |||
| 9 | 3,272 | ||||
| 10 |
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 | |||
| 11 |
Public Consulting Grouppublicconsultinggroup.com
Consulting firm specializing in public sector solutions, improving health, education, and human services agencies to enhance community outcomes. |
2,714 | |||
| 12 |
Digitas North Americadigitas.com
Creation of magnetic brand experiences using data, technology, creative, media, and strategy to deliver integrated marketing solutions globally. |
2,628 | |||
| 13 | 2,033 | ||||
| 14 | 1,916 | ||||
| 15 |
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 | |||
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. | |||||
| 16 |
Analysis Groupanalysisgroup.com
Provides economics, finance, healthcare analytics, and strategy expertise to law firms, Fortune 500 companies, and government agencies globally. |
1,848 | |||
| 17 |
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 | |||
| 18 |
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 | |||
| 19 |
Motion Recruitmentmotionrecruitment.com
An IT talent solutions provider offering recruiting, consulting, and community events to tech enthusiasts across North America |
1,550 | |||
| 20 | 1,542 | ||||
| 21 |
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 | |||
| 22 |
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 | |||
| 23 | 1,109 | ||||
| 24 |
CFScfstaffing.com
A leading employee-owned staffing firm specializing in connecting companies with exceptional accounting, finance, and technology professionals across the United States |
942 | |||
| 25 |
OnProcess Technologyaccenture.com
Connects and harmonizes data across service supply chain to digitize processes, improve customer satisfaction, sustainability, and cost savings. |
919 | |||
| 26 | 875 | ||||
| 27 |
Committee for Public Counsel Servicespubliccounsel.net
This organization in Massachusetts provides legal representation to indigent individuals in criminal, civil, and administrative cases through staff attorneys and private counsel |
851 | |||
| 28 |
Tanisha Systems, Inctanishasystems.com
A leading provider of Custom Application Development and IT Services globally, focusing on client-centric engagement model for optimal results and satisfaction |
838 | |||
| 29 |
Peloton Consulting Grouppelotongroup.com
Specializing in digital transformation, this company offers expertise in EPM, ERP, HCM, SCM, Big Data & Analytics, and cloud-based data applications for organizational change |
830 | |||
| 30 |
Galaxy Weblinks Incgalaxyweblinks.com
A global technology consulting firm providing end-to-end services in product engineering, UX design, mobile/web development, cloud security, QA, ERP, and marketing for enterprises worldwide |
826 | |||
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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.
More company lists in Boston
- The largest companies in Boston 1,089
- Multinational companies in Boston 241
- SaaS companies in Boston 193
- Software Development companies in Boston 145
- Financial services firms in Boston 127
- AI companies in Boston 123
- Venture capital and private equity firms in Boston 99
- Companies with in-house R&D in Boston 88
- Education providers in Boston 87
- Subscription businesses in Boston 87
- Financial Services companies in Boston 86
- Venture Capital and Private Equity Principals companies in Boston 78
- Companies with a mobile app in Boston 62
- Consulting firms in Boston 58
- Data and analytics companies in Boston 57
- IT Services and IT Consulting companies in Boston 56
- AI-native companies in Boston 51
- IT services companies in Boston 50
- Higher Education companies in Boston 48
- Investment Management companies in Boston 47
- Hospitals and Health Care companies in Boston 46
- Critical infrastructure operators in Boston 44
- Healthcare providers in Boston 42
- Non-profit Organizations companies in Boston 36
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 Massachusetts 249
- 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
- Professional services firms in Chicago 196
- 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