| # | Company | Employees |
|---|---|---|
| 1 | 99,488 | |
| 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. |
84,668 |
| 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 |
70,646 |
| 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. |
46,913 |
| 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 |
40,412 |
| 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 |
37,734 |
| 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 |
24,357 |
| 8 |
Publicis Sapientpublicissapient.com
A digital business transformation partner, specializing in strategy, product, experience, engineering, data, and delivering impactful solutions to global organizations |
24,251 |
| 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 |
20,001 |
| 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 |
17,496 |
| 11 |
Northeastern Universitynortheastern.edu
Global research university combining experiential learning with cooperative education, offering diverse programs and addressing health, security, and sustainability challenges worldwide. |
17,385 |
| 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. |
16,431 |
| 13 |
Boston Universitybu.edu
Leading private research and teaching institution with global presence. Inclusive, serving, and collaborating with Boston since 1869. |
15,935 |
| 14 |
Commonwealth of Massachusettsmass.gov
Innovative government agency in Massachusetts pioneering legislative actions and programs to improve services for millions of people Join us! |
14,530 |
| 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. |
13,806 |
| 16 |
Wayfairaboutwayfair.com
Destination for all things home, offering expert customer service, tools for easy shopping, and wide selection to help create personalized spaces |
12,524 |
| 17 |
Harvard Business Schoolhbs.edu
Offers MBA, PhD, executive education, and online programs focused on leadership development, business practice, and entrepreneurship worldwide. |
12,457 |
| 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 |
12,125 |
| 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 |
12,076 |
| 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. |
10,008 |
| 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. |
9,504 |
| 22 |
Dana-Farber Cancer Institutedana-farber.org
Providing expert, compassionate care to children and adults with cancer while advancing understanding, treatment, cure, and prevention. |
8,981 |
| 23 |
athenahealthathenahealth.com
The company strives to simplify healthcare with innovative technology for electronic health records, revenue cycle management, and patient engagement solutions |
8,956 |
| 24 |
CDM Smithcdmsmith.com
This company provides comprehensive solutions in water, environment, transportation, energy, and facilities to worldwide public and private clients |
8,617 |
| 25 | 8,184 | |
| 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 |
7,762 |
| 27 | 7,373 | |
| 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 |
6,425 |
| 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 |
6,382 |
| 30 |
American Toweramericantower.com
Global provider of digital infrastructure supporting mobile and broadband networks, enabling connectivity, innovation, and bridging digital divides worldwide. |
6,111 |
| 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 |
6,090 |
| 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 |
6,018 |
| 33 |
CEOchasedimond.com
The company provides expert insights and guidance in finance, investing, and capital markets to empower clients in making wealth-enhancing decisions |
6,006 |
| 34 | 5,917 | |
| 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. |
5,812 |
| 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 |
5,760 |
| 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. |
5,112 |
| 38 |
John Hancockjohnhancock.com
Providing life insurance, financial planning, and community support services focused on helping customers achieve healthier, longer, and better lives. |
5,048 |
| 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 |
4,963 |
| 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 |
4,862 |
| 41 |
City of Bostonboston.gov
Providing public services focused on community improvement, infrastructure, safety, and inclusivity to enhance quality of life for all residents. |
4,527 |
| 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 |
4,522 |
| 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. |
4,271 |
| 44 |
UMass Bostonumb.edu
Public research university with diverse student body, strong Boston connection, focus on innovative research, student success, and sustainable campus development. |
4,200 |
| 45 |
Aquentaquent.com
Global work solutions company providing talent, technology, and services for businesses through recruiting, creative strategy, project management, and more |
4,071 |
| 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. |
4,070 |
| 47 | 4,065 | |
| 48 |
Reebokreebok.com
It designs and creates fitness gear and experiences, aiming to inspire individuals to achieve their best physically, mentally, and socially. |
4,008 |
| 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. |
3,976 |
| 50 |
Goodwingoodwinlaw.com
Global law firm providing litigation, regulatory compliance, advisory services, and complex transactions for clients in diverse industries worldwide. |
3,975 |
| 51 |
Cabot Corporationcabotcorp.com
Global specialty chemical and performance materials company providing solutions to address current challenges and future customer needs worldwide. |
3,719 |
| 52 |
Berklee College of Musicberklee.edu
A leading college offering top-tier music education for students around the world |
3,696 |
| 53 |
Wellington Managementwellington.com
Independent investment management firm serving diverse clients worldwide with comprehensive capabilities across global equity, fixed income, alternatives, and private markets. |
3,609 |
| 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! |
3,549 |
| 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. |
3,476 |
| 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 |
3,344 |
| 57 | 3,272 | |
| 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. |
3,268 |
| 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. |
3,125 |
| 60 | 3,001 | |
| 61 |
MFS Investment Managementmfs.com
Global investment manager offering active management, disciplined investing, risk management, serving financial advisors, intermediaries, and institutional clients worldwide. |
2,971 |
| 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. |
2,923 |
| 63 | 2,920 | |
| 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 |
2,902 |
| 65 |
Sales Humorthequota.co
A company offering a solution for updating Salesforce quickly and easily, along with a free weekly newsletter for sales professionals |
2,792 |
| 66 |
Public Consulting Grouppublicconsultinggroup.com
Consulting firm specializing in public sector solutions, improving health, education, and human services agencies to enhance community outcomes. |
2,714 |
| 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 |
2,640 |
| 68 |
Digitas North Americadigitas.com
Creation of magnetic brand experiences using data, technology, creative, media, and strategy to deliver integrated marketing solutions globally. |
2,628 |
| 69 |
Suffolk Universitysuffolk.edu
University located in downtown Boston offering personalized education with strong city integration, historic access, and student-focused mentoring relationships. |
2,605 |
| 70 | 2,556 | |
| 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 |
2,530 |
| 72 |
Eastern Bankeasternbank.com
Provides banking, wealth management, and investment solutions for consumers and businesses across eastern Massachusetts, New Hampshire, Rhode Island, and Connecticut. |
2,498 |
| 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 |
2,497 |
| 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 |
2,453 |
| 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 |
2,441 |
| 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 |
2,381 |
| 77 |
Massachusetts Trial Courtmass.gov
Ensuring fair and impartial administration of justice, protecting rights, providing equal access, resolving disputes efficiently, and inspiring public trust |
2,360 |
| 78 |
Semrushsemrush.com
A leading online visibility management platform offering a suite of marketing tools to help companies improve their online presence and results |
2,357 |
| 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. |
2,348 |
| 80 |
argenxargenx.com
Global immunology company focused on developing novel antibody-based medicines for severe autoimmune diseases through collaborations with leading researchers |
2,315 |
| 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. |
2,294 |
| 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 |
2,274 |
| 83 |
Plymouth Rock Assuranceplymouthrock.com
Leading Northeast auto and home insurance provider offering unique customer services and career opportunities with a strong, committed team. |
2,263 |
| 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 |
2,262 |
| 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 |
2,236 |
| 86 |
OutSystemsoutsystems.com
Provides an AI development platform for enterprises to rapidly build custom applications and AI agents while modernizing legacy core business systems. |
2,228 |
| 87 | 2,228 | |
| 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. |
2,225 |
| 89 |
Emerson Collegeemerson.edu
A renowned institution specializing in communication and the arts, empowering diverse students to make a meaningful impact in society |
2,168 |
| 90 |
InterSystemsintersystems.com
InterSystems provides data platforms and connected care solutions for healthcare, business, and government to drive better decisions and outcomes worldwide |
2,127 |
| 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 |
2,102 |
| 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. |
2,080 |
| 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 |
2,054 |
| 94 | 2,033 | |
| 95 | 2,028 | |
| 96 |
Simmons Universitysimmons.edu
A private university in Boston offering innovative teaching, engaged learning, undergraduate programs for women, and various graduate programs |
2,023 |
| 97 | 2,011 | |
| 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. |
1,990 |
| 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 |
1,967 |
| 100 |
Berkshire Hathaway Specialty Insurancebhspecialty.com
Providing tailored specialty insurance solutions and claims services with strong financial backing, focusing on customer flexibility and satisfaction. |
1,933 |
Turn this list into pipeline
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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.
More company lists in Boston
- SaaS companies in Boston 179
- Software Development companies in Boston 131
- Financial Services companies in Boston 73
- Venture Capital and Private Equity Principals companies in Boston 72
- AI-native companies in Boston 49
- Higher Education companies in Boston 47
- IT Services and IT Consulting companies in Boston 45
- Hospitals and Health Care companies in Boston 43
- Investment Management companies in Boston 42
- Non-profit Organizations companies in Boston 36
- Real Estate companies in Boston 33
- Business Consulting and Services companies in Boston 29
- Technology, Information and Internet companies in Boston 27
The same list elsewhere in United States
- The largest companies in the United States 91,636
- The largest companies in New York 6,921
- The largest companies in San Francisco 2,031
- The largest companies in Houston 1,790
- The largest companies in Chicago 1,669
- The largest companies in Los Angeles 1,245
- The largest companies in Atlanta 1,146
- The largest companies in Washington 1,082
- The largest companies in Austin 1,076
- The largest companies in Dallas 1,036
- The largest companies in Miami 879
- The largest companies in San Diego 677
- The largest companies in Denver 645
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- The largest companies in Philadelphia 504
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