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Professional services firms headquartered in Boston

Tamtam tracks 104 professional services firms headquartered in Boston. This list ranks the 30 largest by number of employees on LinkedIn, led by Boston Consulting Group (BCG), Publicis Sapient and CDM Smith. Their median headcount is 1,900. Half of them were founded in 1986 or later.

馃嚭馃嚫 Boston30 companiesUpdated Nov 11, 2026

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.

#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
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
4
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
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.

Business Consulting and Services 馃嚭馃嚫 Boston 4,271 1983
6
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
7
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
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!

IT Services and IT Consulting 馃嚭馃嚫 Boston 3,549 1990
9
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
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.

Business Consulting and Services 馃嚭馃嚫 Boston 3,125 2000
11
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
12
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
13
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
14
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
15
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

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16
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
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

Staffing and Recruiting 馃嚭馃嚫 Boston 1,639 1989
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

Financial Services 馃嚭馃嚫 Boston 1,589 2014
19
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
20
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
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.

Law Practice 馃嚭馃嚫 Boston 1,520 1878
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.

Advertising Services 馃嚭馃嚫 Boston 1,414 1939
23
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
24
CFScfstaffing.com

A leading employee-owned staffing firm specializing in connecting companies with exceptional accounting, finance, and technology professionals across the United States

Staffing and Recruiting 馃嚭馃嚫 Boston 942 1994
25
OnProcess Technologyaccenture.com

Connects and harmonizes data across service supply chain to digitize processes, improve customer satisfaction, sustainability, and cost savings.

Transportation, Logistics, Supply Chain and Storage 馃嚭馃嚫 Boston 919 1998
26
FSGfsg.org

A global nonprofit consulting firm partnering with foundations and corporations to drive equitable systems change through tailored consulting, thought leadership, and learning communities

Business Consulting and Services 馃嚭馃嚫 Boston 875 2000
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

Law Practice 馃嚭馃嚫 Boston 851 n/a
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

IT Services and IT Consulting 馃嚭馃嚫 Boston 838 2002
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

Business Consulting and Services 馃嚭馃嚫 Boston 830 n/a
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

IT Services and IT Consulting 馃嚭馃嚫 Boston 826 2000

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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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