# 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.

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.

🇺🇸 Boston · 30 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 | [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 |
| 4 | [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 |
| 5 | [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 |
| 6 | [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 |  |
| 7 | [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 |
| 8 | [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 |
| 9 | [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 |
| 10 | [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 |
| 11 | [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 |
| 12 | [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 |
| 13 | [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 |  |
| 14 | [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 |
| 15 | [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 |
| 16 | [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 |
| 17 | [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 |
| 18 | [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 |
| 19 | [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 |
| 20 | [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 |
| 21 | [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 |
| 22 | [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 |
| 23 | [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 |
| 24 | [CFS](https://www.tamtam.ai/c/cfs) (cfstaffing.com)<br>A leading employee-owned staffing firm specializing in connecting companies with exceptional accounting, finance, and technology professionals across the United States | Staffing and Recruiting | 🇺🇸 Boston | 942 | 1994 |
| 25 | [OnProcess Technology](https://www.tamtam.ai/c/onprocess-technology) (accenture.com)<br>Connects and harmonizes data across service supply chain to digitize processes, improve customer satisfaction, sustainability, and cost savings. | Transportation, Logistics, Supply Chain and Storage | 🇺🇸 Boston | 919 | 1998 |
| 26 | [FSG](https://www.tamtam.ai/c/fsg) (fsg.org)<br>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 | 🇺🇸 Boston | 875 | 2000 |
| 27 | [Committee for Public Counsel Services](https://www.tamtam.ai/c/committee-for-public-counsel-services) (publiccounsel.net)<br>This organization in Massachusetts provides legal representation to indigent individuals in criminal, civil, and administrative cases through staff attorneys and private counsel | Law Practice | 🇺🇸 Boston | 851 |  |
| 28 | [Tanisha Systems, Inc](https://www.tamtam.ai/c/tanisha-systems-inc) (tanishasystems.com)<br>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 | 🇺🇸 Boston | 838 | 2002 |
| 29 | [Peloton Consulting Group](https://www.tamtam.ai/c/peloton-consulting-group) (pelotongroup.com)<br>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 | 🇺🇸 Boston | 830 |  |
| 30 | [Galaxy Weblinks Inc](https://www.tamtam.ai/c/galaxy-weblinks-inc) (galaxyweblinks.com)<br>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 | 🇺🇸 Boston | 826 | 2000 |

## 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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## The same list elsewhere in United States

- [Professional services firms in the United States](https://www.tamtam.ai/l/professional-services-firms-united-states) (7,078)
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- [Professional services firms in California](https://www.tamtam.ai/l/professional-services-firms-california) (880)
- [Professional services firms in Texas](https://www.tamtam.ai/l/professional-services-firms-texas) (629)
- [Professional services firms in Florida](https://www.tamtam.ai/l/professional-services-firms-florida) (375)
- [Professional services firms in Virginia](https://www.tamtam.ai/l/professional-services-firms-virginia) (344)
- [Professional services firms in Illinois](https://www.tamtam.ai/l/professional-services-firms-illinois) (339)
- [Professional services firms in Massachusetts](https://www.tamtam.ai/l/professional-services-firms-massachusetts) (249)
- [Professional services firms in New Jersey](https://www.tamtam.ai/l/professional-services-firms-new-jersey) (249)
- [Professional services firms in Georgia](https://www.tamtam.ai/l/professional-services-firms-georgia) (246)
- [Professional services firms in Pennsylvania](https://www.tamtam.ai/l/professional-services-firms-pennsylvania) (245)
- [Professional services firms in Ohio](https://www.tamtam.ai/l/professional-services-firms-ohio) (195)
- [Professional services firms in Maryland](https://www.tamtam.ai/l/professional-services-firms-maryland) (176)
- [Professional services firms in Michigan](https://www.tamtam.ai/l/professional-services-firms-michigan) (172)
- [Professional services firms in Washington State](https://www.tamtam.ai/l/professional-services-firms-washington-state) (163)
- [Professional services firms in North Carolina](https://www.tamtam.ai/l/professional-services-firms-north-carolina) (142)
- [Professional services firms in Alabama](https://www.tamtam.ai/l/professional-services-firms-alabama) (135)
- [Professional services firms in Minnesota](https://www.tamtam.ai/l/professional-services-firms-minnesota) (125)
- [Professional services firms in New York](https://www.tamtam.ai/l/professional-services-firms-new-york) (735)
- [Professional services firms in Chicago](https://www.tamtam.ai/l/professional-services-firms-chicago) (196)
- [Professional services firms in Houston](https://www.tamtam.ai/l/professional-services-firms-houston) (156)
- [Professional services firms in Atlanta](https://www.tamtam.ai/l/professional-services-firms-atlanta) (143)
- [Professional services firms in San Francisco](https://www.tamtam.ai/l/professional-services-firms-san-francisco) (130)
- [Professional services firms in Washington](https://www.tamtam.ai/l/professional-services-firms-washington) (109)

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