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The 100 largest companies in Boston

Tamtam tracks 988 companies headquartered in Boston. This list ranks the 100 largest by number of employees on LinkedIn, led by GE, Fidelity Investments and GE Vernova. Their median headcount is 3,975. Half of them were founded in 1976 or later.

馃嚭馃嚫 Boston100 companiesUpdated Oct 9, 2026
#CompanyIndustryHeadquarters EmployeesFounded
1
GEge.com

Focus on advancing aviation and energy industries through innovative technologies and solutions shared via specialized aerospace and energy platforms.

Industrial Machinery Manufacturing 馃嚭馃嚫 Boston 99,488 n/a
2
Fidelity Investmentsfidelity.com

Financial well-being through diversified market-leading services for individuals, families, employers, wealth management firms, and institutions using trillions in administered and discretionary assets.

Financial Services 馃嚭馃嚫 Boston 84,668 1946
3
GE Vernovalinktree.com

A purpose-built company focused on electrifying the planet and decarbonizing it through a diverse portfolio of energy businesses, ensuring reliable and sustainable energy

Energy Technology 馃嚭馃嚫 Boston 70,646 n/a
4
State Streetstatestreet.com

Global financial leader providing comprehensive investment services, institutional asset management, multi-asset trading, and digital solutions to enhance portfolio performance and decision making.

Financial Services 馃嚭馃嚫 Boston 46,913 1792
5
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
6
Liberty Mutual Insurancelibertymutualgroup.com

Global leader in property and casualty insurance dedicated to fostering career growth, social responsibility, sustainability, diversity, and innovative solutions for customers worldwide

Insurance 馃嚭馃嚫 Boston 37,734 1912
7
Iron Mountainironmountain.com

Global leader in storage and information management services, partnering with organizations worldwide to protect and unlock the value of their assets and data

IT Services and IT Consulting 馃嚭馃嚫 Boston 24,357 n/a
8
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
9
Massachusetts General Hospitalmassgeneral.org

Dedicated to providing top-notch healthcare in a compassionate environment through innovative research and education, improving health in diverse communities served

Hospitals and Health Care 馃嚭馃嚫 Boston 20,001 1811
10
Boston Children's Hospitalchildrenshospital.org

A leading pediatric medical center providing comprehensive healthcare services for children from birth to 21 years, with specialized clinical programs and renowned physicians

Hospitals and Health Care 馃嚭馃嚫 Boston 17,496 1869
11
Northeastern Universitynortheastern.edu

Global research university combining experiential learning with cooperative education, offering diverse programs and addressing health, security, and sustainability challenges worldwide.

Higher Education 馃嚭馃嚫 Boston 17,385 n/a
12
Boston University School of Public Healthbu.edu

Graduate education and research in public health fields, focusing on improving health of vulnerable populations through policy and practice.

Higher Education 馃嚭馃嚫 Boston 16,431 1976
13
Boston Universitybu.edu

Leading private research and teaching institution with global presence. Inclusive, serving, and collaborating with Boston since 1869.

Higher Education 馃嚭馃嚫 Boston 15,935 1869
14
Commonwealth of Massachusettsmass.gov

Innovative government agency in Massachusetts pioneering legislative actions and programs to improve services for millions of people Join us!

Government Administration 馃嚭馃嚫 Boston 14,530 1788
15
Santander USsantanderus.com

Provides auto, retail, commercial, and investment banking services alongside wealth management for millions of customers across various US hubs and global markets.

Financial Services 馃嚭馃嚫 Boston 13,806 1857
16
Wayfairaboutwayfair.com

Destination for all things home, offering expert customer service, tools for easy shopping, and wide selection to help create personalized spaces

Retail 馃嚭馃嚫 Boston 12,524 2002
17
Harvard Business Schoolhbs.edu

Offers MBA, PhD, executive education, and online programs focused on leadership development, business practice, and entrepreneurship worldwide.

Higher Education 馃嚭馃嚫 Boston 12,457 1908
18
Beth Israel Deaconess Medical Centerbidmc.org

World-class teaching hospital in Boston, part of a health care system focused on expanding access to great care, advancing medicine through research and education

Hospitals and Health Care 馃嚭馃嚫 Boston 12,125 n/a
19
Harvard Medical Schoolhms.harvard.edu

A prestigious medical school fostering a diverse community of leaders dedicated to advancing knowledge, education, and research to alleviate human suffering

Higher Education 馃嚭馃嚫 Boston 12,076 n/a
20
Boston Medical Center (BMC)bmc.org

Academic medical center providing innovative, equitable healthcare across 70 specialties, focusing on community wellbeing, health equity, and cutting-edge research.

Hospitals and Health Care 馃嚭馃嚫 Boston 10,008 n/a
21
Boston Public Schoolsbostonpublicschools.org

Transforms children's lives through exemplary teaching and community partnerships to develop essential knowledge and skills for success in college, career, and life.

Education Administration Programs 馃嚭馃嚫 Boston 9,504 1647
22
Dana-Farber Cancer Institutedana-farber.org

Providing expert, compassionate care to children and adults with cancer while advancing understanding, treatment, cure, and prevention.

Hospitals and Health Care 馃嚭馃嚫 Boston 8,981 1947
23
athenahealthathenahealth.com

The company strives to simplify healthcare with innovative technology for electronic health records, revenue cycle management, and patient engagement solutions

IT Services and IT Consulting 馃嚭馃嚫 Boston 8,956 1997
24
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
25
PTCptc.com

It provides solutions for manufacturers to enhance product differentiation, operational excellence, and workforce productivity through digital transformation and technology.

Software Development 馃嚭馃嚫 Boston 8,184 n/a
26
Toastpos.toasttab.com

Toast empowers restaurants with cloud-based software and hardware to streamline operations, drive revenue, and enhance guest experience through POS, marketing, and HR solutions

Software Development 馃嚭馃嚫 Boston 7,762 2011
27
Temutemu.com

Online marketplace connecting consumers with millions of merchandise partners, manufacturers, and brands offering affordable products worldwide.

Technology, Information and Internet 馃嚭馃嚫 Boston 7,373 n/a
28
Harvard Business School Executive Educationexed.hbs.edu

Executive Education provider offering open-enrollment and custom learning solutions for executives to enhance management skills and drive corporate advantage

Higher Education 馃嚭馃嚫 Boston 6,425 n/a
29
Vertex Pharmaceuticalsvrtx.com

Global biotechnology company focusing on creating medicines for serious and life-threatening diseases, with a pioneering history in treating cystic fibrosis

Biotechnology Research 馃嚭馃嚫 Boston 6,382 1989
30
American Toweramericantower.com

Global provider of digital infrastructure supporting mobile and broadband networks, enabling connectivity, innovation, and bridging digital divides worldwide.

Telecommunications 馃嚭馃嚫 Boston 6,111 1995
31
Dynatracedynatrace.com

This company specializes in providing a platform that unifies observability, business, and security data with AI-driven analytics and automation to optimize cloud operations and ensure flawless digital experiences

Software Development 馃嚭馃嚫 Boston 6,090 n/a
32
Tufts Medical Centertuftsmedicine.org

Academic medical center offering exceptional care in New England, specializing in primary care, trauma, heart transplants, and various specialties Conducts medical research and education

Hospitals and Health Care 馃嚭馃嚫 Boston 6,018 1796
33
CEOchasedimond.com

The company provides expert insights and guidance in finance, investing, and capital markets to empower clients in making wealth-enhancing decisions

Business Consulting and Services 馃嚭馃嚫 Boston 6,006 2015
34
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
35
Veolia | North Americaveolianorthamerica.com

Provides resource management solutions including water decontamination, toxic waste handling, fossil fuel alternatives, wastewater reuse, and battery recycling for cities and industries.

Environmental Services 馃嚭馃嚫 Boston 5,812 n/a
36
DraftKings Inc.careers.draftkings.com

The company is committed to creating popular games and betting experiences, leading the way in sports entertainment, innovation, and global collaboration

Mobile Gaming Apps 馃嚭馃嚫 Boston 5,760 2012
37
Alexion Pharmaceuticals, Inc.alexion.com

Development of innovative medicines targeting rare diseases, focusing on complement system biology, expanding global reach to serve patients worldwide.

Biotechnology Research 馃嚭馃嚫 Boston 5,112 1992
38
John Hancockjohnhancock.com

Providing life insurance, financial planning, and community support services focused on helping customers achieve healthier, longer, and better lives.

Financial Services 馃嚭馃嚫 Boston 5,048 n/a
39
Xceedancexceedance.com

Provider of strategic operations support, technology, and data services for insurance organizations globally, enhancing efficiencies and optimizing business processes with expertise in underwriting, analytics, and more

Insurance 馃嚭馃嚫 Boston 4,963 2013
40
The Stepping Stones Group, LLCthesteppingstonesgroup.com

Providing exceptional therapeutic and behavioral services to children and families in schools, homes, and clinics across 42 states

Hospitals and Health Care 馃嚭馃嚫 Boston 4,862 2014
41
City of Bostonboston.gov

Providing public services focused on community improvement, infrastructure, safety, and inclusivity to enhance quality of life for all residents.

Government Administration 馃嚭馃嚫 Boston 4,527 n/a
42
Conversecareers.converse.com

This company creates iconic street style sneakers like Chuck Taylor All Stars and One Stars that redefine sport, street, and creative culture

Retail 馃嚭馃嚫 Boston 4,522 1908
43
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
44
UMass Bostonumb.edu

Public research university with diverse student body, strong Boston connection, focus on innovative research, student success, and sustainable campus development.

Higher Education 馃嚭馃嚫 Boston 4,200 1964
45
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
46
Blue Cross Blue Shield of Massachusettsbluecrossma.org

Provides health insurance coverage to over 3 million members, focusing on community wellness, inclusivity, and employee development in Massachusetts.

Hospitals and Health Care 馃嚭馃嚫 Boston 4,070 1937
47
MBTAmbta.com

Operates comprehensive bus, subway, commuter rail, and ferry services across greater Boston, providing essential public transportation modes for millions of local residents.

Government Administration 馃嚭馃嚫 Boston 4,065 1897
48
Reebokreebok.com

It designs and creates fitness gear and experiences, aiming to inspire individuals to achieve their best physically, mentally, and socially.

Manufacturing 馃嚭馃嚫 Boston 4,008 1895
49
Year Up Unitedyearup.org

Provides young adults from diverse backgrounds with training and opportunities to access meaningful careers, addressing workforce talent gaps and economic inequity.

Non-profit Organizations 馃嚭馃嚫 Boston 3,976 2000
50
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
51
Cabot Corporationcabotcorp.com

Global specialty chemical and performance materials company providing solutions to address current challenges and future customer needs worldwide.

Chemical Manufacturing 馃嚭馃嚫 Boston 3,719 1882
52
Berklee College of Musicberklee.edu

A leading college offering top-tier music education for students around the world

Musicians 馃嚭馃嚫 Boston 3,696 1946
53
Wellington Managementwellington.com

Independent investment management firm serving diverse clients worldwide with comprehensive capabilities across global equity, fixed income, alternatives, and private markets.

Investment Management 馃嚭馃嚫 Boston 3,609 1933
54
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
55
University of Massachusettsyoutube.com

Public university system offering high-quality education, conducting extensive research, and providing impactful public service to communities locally and globally.

Higher Education 馃嚭馃嚫 Boston 3,476 1863
56
Pyramid Global Hospitalitypyramidglobal.com

Pyramid Global Hospitality is a leading hotel management company with a strong focus on employee development and a people-centric culture

Hospitality 馃嚭馃嚫 Boston 3,344 n/a
57
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
58
Rapid7rapid7.com

Global leader in AI-powered managed cybersecurity operations, advancing organizations' cyber resilience through integrating security data, AI, and threat intelligence to reduce risk and disrupt attackers.

Computer and Network Security 馃嚭馃嚫 Boston 3,268 n/a
59
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
60
Zeliszelis.com

A healthcare technology company streamlining financial processes for payers, providers, and consumers, driving results through innovative technology and expertise

Professional Services 馃嚭馃嚫 Boston 3,001 n/a
61
MFS Investment Managementmfs.com

Global investment manager offering active management, disciplined investing, risk management, serving financial advisors, intermediaries, and institutional clients worldwide.

Investment Management 馃嚭馃嚫 Boston 2,971 1924
62
Suffolk Constructionsuffolk.com

National construction management firm providing real estate investment, design, self-perform construction, technology investment, and innovation research services across multiple industries.

Construction 馃嚭馃嚫 Boston 2,923 1982
63
City Yearlinktr.ee

Organization supporting students and schools with diverse teams of AmeriCorps members, improving academic outcomes and fostering civic engagement in communities nationwide and internationally

Non-profit Organizations 馃嚭馃嚫 Boston 2,920 1988
64
Klaviyoklaviyo.com

Unified customer platform empowering brands with ownership of consumer data to automate personalized email/SMS communications, foster customer relationships, and drive growth

Marketing Services 馃嚭馃嚫 Boston 2,902 2012
65
Sales Humorthequota.co

A company offering a solution for updating Salesforce quickly and easily, along with a free weekly newsletter for sales professionals

Internet Publishing 馃嚭馃嚫 Boston 2,792 2014
66
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
67
Harvard T.H. Chan School of Public Healthhsph.harvard.edu

A historic institution rooted in public health activism, offering professional training programs in preventive medicine and sanitary engineering since 1913

Higher Education 馃嚭馃嚫 Boston 2,640 n/a
68
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
69
Suffolk Universitysuffolk.edu

University located in downtown Boston offering personalized education with strong city integration, historic access, and student-focused mentoring relationships.

Higher Education 馃嚭馃嚫 Boston 2,605 n/a
70
GoTogoto.com

Provides cloud communications and IT solutions, addressing real-world challenges with practical innovations for small and midsize businesses, scalable to enterprises worldwide.

Software Development 馃嚭馃嚫 Boston 2,556 n/a
71
Haemoneticshaemonetics.com

A global healthcare company offering innovative medical products and solutions to improve patient care and reduce healthcare costs in various medical markets

Medical Equipment Manufacturing 馃嚭馃嚫 Boston 2,530 1971
72
Eastern Bankeasternbank.com

Provides banking, wealth management, and investment solutions for consumers and businesses across eastern Massachusetts, New Hampshire, Rhode Island, and Connecticut.

Banking 馃嚭馃嚫 Boston 2,498 1818
73
Massachusetts College of Pharmacy and Health Sciencesmcphs.edu

A leading institution in Boston offering over 100 healthcare programs to prepare students for successful careers and leadership roles

Higher Education 馃嚭馃嚫 Boston 2,497 1823
74
Columbia Threadneedle Investmentscolumbiathreadneedle.com

Global investment firm offering diverse expertise, sustainable investment decisions, and continuous improvement to manage over $637 billion for a better future

Financial Services 馃嚭馃嚫 Boston 2,453 n/a
75
Spaulding Rehabilitation Hospitalspauldingrehab.org

A leading rehabilitation facility providing comprehensive treatment, part of a network with specialty hospitals, skilled nursing facilities, and outpatient centers in Eastern Massachusetts

Hospitals and Health Care 馃嚭馃嚫 Boston 2,441 1971
76
Private School Innovatorexist.com

This company, which no longer exists, provided services or products in a specific industry, but has ceased operations since then

Appliances, Electrical, and Electronics Manufacturing 馃嚭馃嚫 Boston 2,381 n/a
77
Massachusetts Trial Courtmass.gov

Ensuring fair and impartial administration of justice, protecting rights, providing equal access, resolving disputes efficiently, and inspiring public trust

Administration of Justice 馃嚭馃嚫 Boston 2,360 1692
78
Semrushsemrush.com

A leading online visibility management platform offering a suite of marketing tools to help companies improve their online presence and results

Software Development 馃嚭馃嚫 Boston 2,357 2008
79
State Street Investment Managementstatestreet.com

Delivers global investment solutions, managing diverse institutional assets through indexing and ETFs while providing cost-effective strategies for intermediaries and investors across sixty countries.

Financial Services 馃嚭馃嚫 Boston 2,348 n/a
80
argenxargenx.com

Global immunology company focused on developing novel antibody-based medicines for severe autoimmune diseases through collaborations with leading researchers

Biotechnology Research 馃嚭馃嚫 Boston 2,315 2008
81
Bain Capitalbaincapital.com

Global investment firm managing assets across private equity, credit, public equity, venture capital, and real estate to create impact for diverse stakeholders.

Financial Services 馃嚭馃嚫 Boston 2,294 1984
82
Clinton Health Access Initiative, Inc.clintonhealthaccess.org

Global health organization improving health outcomes in low- and middle-income countries by strengthening health systems and negotiating price reductions for drugs and health tools

Non-profit Organizations 馃嚭馃嚫 Boston 2,274 2002
83
Plymouth Rock Assuranceplymouthrock.com

Leading Northeast auto and home insurance provider offering unique customer services and career opportunities with a strong, committed team.

Insurance 馃嚭馃嚫 Boston 2,263 1983
84
The Boston Beer Companybostonbeer.com

A passionate beer company with 40 years of brewing experience, focused on cultivating talent and pushing boundaries while having fun

Food and Beverage Services 馃嚭馃嚫 Boston 2,262 1984
85
Curium Pharmacuriumpharma.com

Global leader in nuclear medicine, providing life-changing diagnostics and treatment for cancer patients worldwide through innovative radiopharmaceutical products and AI-driven solutions

Pharmaceutical Manufacturing 馃嚭馃嚫 Boston 2,236 2017
86
OutSystemsoutsystems.com

Provides an AI development platform for enterprises to rapidly build custom applications and AI agents while modernizing legacy core business systems.

Software Development 馃嚭馃嚫 Boston 2,228 2001
87
Perkperk.com

A hyper-growth SaaS business travel platform revolutionizing business travel with an all-in-one solution for companies and organizations worldwide

Technology, Information and Internet 馃嚭馃嚫 Boston 2,228 2015
88
HealthEdgehealthedge.com

Connecting health plans, providers, and patients using end-to-end digital technology solutions to support new business models, reduce administrative costs, and improve health outcomes.

Software Development 馃嚭馃嚫 Boston 2,225 2005
89
Emerson Collegeemerson.edu

A renowned institution specializing in communication and the arts, empowering diverse students to make a meaningful impact in society

Higher Education 馃嚭馃嚫 Boston 2,168 n/a
90
InterSystemsintersystems.com

InterSystems provides data platforms and connected care solutions for healthcare, business, and government to drive better decisions and outcomes worldwide

Software Development 馃嚭馃嚫 Boston 2,127 1978
91
Boston University School of Medicinebumc.bu.edu

A dedicated medical school focused on educating students, conducting research, and promoting public health with values of excellence and social justice

Higher Education 馃嚭馃嚫 Boston 2,102 1848
92
Grand Circle Corporationoattravel.com

Provider of international vacations and small group travel experiences for Americans aged 50 and older, focusing on value and unique itineraries.

Travel Arrangements 馃嚭馃嚫 Boston 2,080 n/a
93
UST HealthProofusthealthproof.com

The company provides core administrative solutions for health plans, focusing on scalability, cost-effectiveness, integration, and consumer-centricity to reduce administrative costs

Hospitals and Health Care 馃嚭馃嚫 Boston 2,054 n/a
94
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
95
MassDOTmass.gov

The company partners with communities and agencies to support infrastructure programs in Massachusetts, focusing on enhancing transportation and improving residents' quality of life

Government Administration 馃嚭馃嚫 Boston 2,028 2009
96
Simmons Universitysimmons.edu

A private university in Boston offering innovative teaching, engaged learning, undergraduate programs for women, and various graduate programs

Higher Education 馃嚭馃嚫 Boston 2,023 1899
97
Laterlater.com

It provides social and influencer marketing solutions, helping brands create engaging content and collaborate with creators for better audience reach.

Marketing Services 馃嚭馃嚫 Boston 2,011 2014
98
Natixis Investment Managersnatixis.com

Multi-affiliate asset management firm providing diverse investment solutions, active management expertise, and sustainable ESG strategies to global clients for long-term financial goals.

Financial Services 馃嚭馃嚫 Boston 1,990 n/a
99
Harvard Medical School and Massachusetts General Hospitalmassgeneral.org

A prestigious hospital affiliated with Harvard Medical School, offering clinical experience and clerkships while supporting a large research enterprise

Higher Education 馃嚭馃嚫 Boston 1,967 1811
100
Berkshire Hathaway Specialty Insurancebhspecialty.com

Providing tailored specialty insurance solutions and claims services with strong financial backing, focusing on customer flexibility and satisfaction.

Insurance 馃嚭馃嚫 Boston 1,933 n/a

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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 Oct 9, 2026.

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