| # | Company | Employees |
|---|---|---|
| 1 |
Thermo Fisher Scientificthermofisher.com
A global leader in science services, providing innovative technologies and pharmaceutical support to make the world healthier, cleaner, and safer |
100,256 |
| 2 | 99,488 | |
| 3 |
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 |
| 4 |
GE Vernovalinktr.ee
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 |
| 5 |
The TJX Companies, Inc.jobs.tjx.com
Leading global off-price retailer offering apparel and home fashions through seven brands across nine countries, nearly 4,700 stores, and five e-commerce sites. |
57,100 |
| 6 |
Boston Scientificbostonscientific.com
Develops and provides innovative medical technologies including devices and therapies for various diseases, improving patient health and reducing healthcare costs worldwide. |
54,633 |
| 7 |
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 |
| 8 |
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 |
| 9 |
Dunkin'โdunkindonuts.com
A global franchisor of QSRs serving coffee, baked goods, and ice cream with over 19,000 restaurants worldwide Headquarters in Massachusetts |
38,361 |
| 10 |
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 |
| 11 |
Harvard Universityharvard.edu
An institution dedicated to teaching, learning, and research, producing global leaders across disciplines since 1636 Maintains flagship social media channels |
34,940 |
| 12 |
Staplesstaples.com
A leading provider of workspace products and solutions, utilizing human expertise to enhance technology for businesses of all sizes in North America |
32,875 |
| 13 |
Analog Devicesanalog.com
Global semiconductor company combining analog, digital, and software technologies to advance digitized factories, mobility, healthcare, and climate solutions. |
27,234 |
| 14 |
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 |
| 15 |
Publicis Sapientpublicissapient.com
A digital business transformation partner, specializing in strategy, product, experience, engineering, data, and delivering impactful solutions to global organizations |
24,251 |
| 16 |
Bain & Companybain.com
Global consultancy aiding ambitious change makers define the future, achieving extraordinary results, outperforming competition, redefining industries, and tackling urgent societal challenges. |
23,729 |
| 17 |
Massachusetts Institute of Technologyweb.mit.edu
A private research university in Cambridge, Massachusetts, advancing knowledge and educating students in science and technology-focused areas |
23,586 |
| 18 |
Charles River Laboratoriescriver.com
Guided by strong purpose, creating healthier lives, focusing on therapeutics for patients, animal care, planet well-being, and its passionate, skilled people. |
22,000 |
| 19 | 20,440 | |
| 20 |
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 |
| 21 |
Preplypreply.com
The company connects learners with online tutors worldwide, offering live language classes with AI tools and learning materials for progress and engagement |
18,061 |
| 22 |
Virtusavirtusa.com
Digital engineering and technology services provider for Forbes Global 2000 companies worldwide, focusing on innovative solutions and impactful results through an "Engineering First" approach |
18,045 |
| 23 |
Stop & Shopstopandshop.com
Established in 1914, this company operates over 400 stores in the Northeast, prioritizing customer satisfaction, community involvement, and employee development |
17,955 |
| 24 |
Amazon Fulfillment Technologies & Roboticsamazon.jobs
The company partners people with intelligent robots to enhance order fulfillment accuracy, create new jobs worldwide, and improve customer experience |
17,911 |
| 25 |
Mass General Brighammassgeneralbrigham.org
Integrated academic health system providing patient care, research, teaching, and community services through hospitals, insurance, and specialized medical centers. |
17,890 |
| 26 |
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 |
| 27 |
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 |
| 28 |
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 |
| 29 |
BJ's Wholesale Clubbjs.com
Wholesale club offering members bulk products with a focus on value, service, and a strong company culture for success. |
16,273 |
| 30 |
Boston Universitybu.edu
Leading private research and teaching institution with global presence. Inclusive, serving, and collaborating with Boston since 1869. |
15,935 |
| 31 |
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 |
| 32 |
Bright Horizonsbrighthorizons.com
Provides on-site childcare, backup care, and education programs to support employees, enhance workplace culture, and develop critical skills. |
14,333 |
| 33 |
Keurig Dr Pepper Inc.keurigdrpepper.com
Leading North American beverage company with extensive portfolio including coffee, soft drinks, water, juice, and mixers, strong distribution network. |
13,948 |
| 34 |
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 |
| 35 |
Clean Harborscleanharbors.com
Provider of hazardous waste management, emergency spill response, industrial cleaning, recycling, and used oil re-refining services across North America. |
13,449 |
| 36 |
MassMutualmassmutual.com
Providing mutual life insurance and financial security services focused on community support, shared dependence, and long-term happiness. |
13,000 |
| 37 |
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 |
| 38 |
Harvard Business Schoolhbs.edu
Offers MBA, PhD, executive education, and online programs focused on leadership development, business practice, and entrepreneurship worldwide. |
12,457 |
| 39 |
HubSpothubspot.com
It provides a comprehensive CRM platform with marketing, sales, and service tools, fostering employee growth and a flexible workplace culture. |
12,229 |
| 40 |
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 |
| 41 |
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 |
| 42 |
University at Buffalobuffalo.edu
Extraordinary community, creative activity and research changing the world. New York State's flagship university, AAU member. |
11,906 |
| 43 |
Waters Corporationwaters.com
A global leader in analytical instruments and software, pioneering innovations in chromatography, mass spectrometry, and thermal analysis for various sciences |
11,842 |
| 44 |
New Balancenewbalance.com
Designing and manufacturing high-quality athletic footwear and apparel with a focus on comfort, fit, innovation, and community support worldwide. |
11,624 |
| 45 |
University of Massachusetts Amherstumass.edu
A top-ranked teaching and research institution in western Massachusetts with about 28,500 students, part of the University of Massachusetts system |
11,525 |
| 46 |
UMass Memorial Healthummhealth.org
Largest healthcare system in Central Massachusetts offering hospital care, outpatient services, medical training, research, and community health support. |
10,819 |
| 47 |
Akamai Technologiesakamai.com
A global leader in internet infrastructure, Akamai powers and protects online experiences for billions of users daily through innovative solutions |
10,647 |
| 48 |
Harvard Business Reviewhbr.org
Provides professionals rigorous insights, best practices to lead effectively, make positive impact, bridging academia and global enterprises. |
9,905 |
| 49 |
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 |
| 50 |
Boston Collegebc.edu
A Jesuit Catholic university in Boston that emphasizes academic excellence, leadership, and service to society |
9,503 |
| 51 |
EG Americaeg-america.com
A rapidly growing convenience store retailer in the US, part of a global company, offering top-notch products and services nationwide |
9,343 |
| 52 |
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 |
| 53 |
athenahealthathenahealth.com
The company strives to simplify healthcare with innovative technology for electronic health records, revenue cycle management, and patient engagement solutions |
8,956 |
| 54 |
Netcracker Technologynetcracker.com
It is a software company providing critical solutions for service providers, focusing on digital transformation and cloud opportunities worldwide. |
8,935 |
| 55 |
CDM Smithcdmsmith.com
This company provides comprehensive solutions in water, environment, transportation, energy, and facilities to worldwide public and private clients |
8,617 |
| 56 | 8,184 | |
| 57 |
Tufts Universitytufts.edu
Research university fostering innovation, creativity, and global citizenship through a unique blend of research and liberal arts education. |
7,773 |
| 58 |
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 |
| 59 |
Biogenbiogen.com
Company pioneers innovative science, delivering new medicines to transform patients' lives, with a global presence and focus on superior treatment outcomes. |
7,724 |
| 60 |
Sensata Technologiessensata.com
Supplier of sensing, electrical protection, control, and power management solutions enhancing safety, efficiency, and comfort across multiple industries worldwide. |
7,634 |
| 61 |
UniFirst Corporationunifirst.com
Supply and service of uniforms, workwear, safety products, and facility services with manufacturing and specialized garment programs. |
7,485 |
| 62 | 7,373 | |
| 63 |
UMass Memorial Medical Centerummhealth.org
A trusted academic medical center in Central Massachusetts, providing comprehensive and award-winning care through cutting-edge technology and highly trained specialists |
7,256 |
| 64 |
Hologic, Inc.hologic.com
Develops innovative medical products, especially for women's health, focusing on early detection and better outcomes across breast, skeletal, diagnostic, and GYN surgical solutions. |
6,921 |
| 65 |
Modernamodernatx.com
Pioneering mRNA technology for new medicines to improve patient lives by providing real-time instructions for protein production in cells |
6,906 |
| 66 |
Partners HealthCarepartners.org
Integrated healthcare system offering coordinated care, high-quality services, research, teaching, and community outreach through academic medical centers and various healthcare entities |
6,751 |
| 67 |
Bose Corporationbose.com
Develops advanced audio technologies and products for home, automotive, portable, and public spaces, enhancing music listening experiences worldwide. |
6,699 |
| 68 |
Entegrisentegris.com
A global leader in advanced science-based solutions for technology challenges, driving innovation with artificial intelligence, augmented reality, and IoT technologies |
6,612 |
| 69 |
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 |
| 70 |
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 |
| 71 |
UMass Chan Medical Schoolumassmed.edu
Trains doctors, scientists, and nurses, conducts groundbreaking research and clinical trials, offers consulting services, and manufactures vaccines and biologics. |
6,314 |
| 72 |
Baystate Healthbaystatehealth.org
Largest healthcare organization in western Massachusetts providing quality, compassionate care across hospitals, improving community health and economic impact. |
6,269 |
| 73 |
Vistavistaprint.com
Global design and marketing partner for small businesses worldwide, providing full-service solutions for physical and digital presence to achieve success |
6,238 |
| 74 |
Teradyneteradyne.com
This company provides advanced test solutions for semiconductors, electronic systems, wireless devices, and robotics to improve productivity and lower costs for manufacturers worldwide |
6,210 |
| 75 |
Rich Products Corporationrichs.com
A family-owned food company providing a wide range of products for home, restaurant, and bakery use, focused on inspiring possibilities and helping food industry professionals succeed |
6,208 |
| 76 |
American Toweramericantower.com
Global provider of digital infrastructure supporting mobile and broadband networks, enabling connectivity, innovation, and bridging digital divides worldwide. |
6,111 |
| 77 |
Cultural Care Au Pairculturalcare.com
Connecting international au pairs with American families for childcare, cultural exchange, and enriching year-long experiences in the USA. |
6,091 |
| 78 |
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 |
| 79 |
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 |
| 80 |
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 |
| 81 |
Ascend Learningascendlearning.com
Provides learning technology and certification products for healthcare and licensure-driven careers, supporting professionals across various high-growth industries. |
5,982 |
| 82 | 5,917 | |
| 83 |
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 |
| 84 |
Tripadvisortripadvisor.com
A leading travel guidance platform with 1 billion reviews, offering deals on accommodations, experiences, and restaurants to help travelers plan their trips |
5,762 |
| 85 |
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 |
| 86 | 5,680 | |
| 87 |
Lionbridgelionbridge.com
This company specializes in translation and localization services in over 350 languages, connecting global brands with customers worldwide through cultural experiences |
5,583 |
| 88 |
Pegasystemspega.com
It provides a low-code platform for organizations to enhance agility, automate workflows, and address business challenges using AI technology. |
5,569 |
| 89 |
eClinicalWorkseclinicalworks.com
It provides Electronic Health Record and Practice Management solutions to medical professionals, enhancing care quality and reducing costs through technology. |
5,426 |
| 90 |
Insulet Corporationinsulet.com
Simplifying diabetes management for individuals with the Omnipod platform, offering tubeless, wearable insulin delivery and automated blood sugar control without injections or fingersticks globally. |
5,407 |
| 91 |
Staples Business Advantagestaplesadvantage.com
A provider of products and services for organizations, including office supplies, technology, promotional products, furniture, and facility supplies, with personalized account support |
5,279 |
| 92 |
Lahey Hospital & Medical Centerlahey.org
A physician-led, nonprofit group practice offering compassionate care, superior patient outcomes, personalized treatment plans, advanced technology, research, and medical education |
5,147 |
| 93 |
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 |
| 94 |
Kaleida Healthkaleidahealth.org
Leading healthcare provider in Western New York offering state-of-the-art technology, comprehensive services, and compassionate care to over one million patients annually |
5,060 |
| 95 |
John Hancockjohnhancock.com
Providing life insurance, financial planning, and community support services focused on helping customers achieve healthier, longer, and better lives. |
5,048 |
| 96 |
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 |
| 97 |
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 |
| 98 |
Brukerbruker.com
Development and provision of advanced analytical instrumentation and solutions for research, industrial production, quality assurance, and process reliability worldwide. |
4,824 |
| 99 |
University of Massachusetts Lowelluml.edu
Public university offering affordable, high-quality education with hands-on learning, accredited programs, and strong student support for career readiness. |
4,772 |
| 100 | 4,581 |
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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 24, 2026.
More company lists in Massachusetts
- SaaS companies in Massachusetts 322
- Software Development companies in Massachusetts 245
- Hospitals and Health Care companies in Massachusetts 193
- Financial services firms in Massachusetts 166
- Education providers in Massachusetts 160
- Higher Education companies in Massachusetts 157
- IT Services and IT Consulting companies in Massachusetts 147
- Venture capital and private equity firms in Massachusetts 141
- Financial Services companies in Massachusetts 127
- Manufacturers in Massachusetts 119
- AI companies in Massachusetts 116
- Critical infrastructure operators in Massachusetts 108
- Healthcare providers in Massachusetts 108
- Retail chains in Massachusetts 107
- Venture Capital and Private Equity Principals companies in Massachusetts 107
- Biotechnology Research companies in Massachusetts 97
- IT services companies in Massachusetts 93
- AI-native companies in Massachusetts 88
- Real Estate companies in Massachusetts 82
- Pharmaceutical companies in Massachusetts 82
- Non-profit Organizations companies in Massachusetts 77
- Contract manufacturers in Massachusetts 69
- Energy companies in Massachusetts 69
- Medical Equipment Manufacturing companies in Massachusetts 69
The same list elsewhere in United States
- The largest companies in the United States 91,669
- The largest companies in California 12,813
- The largest companies in New York State 10,485
- The largest companies in Texas 8,086
- The largest companies in Florida 4,945
- The largest companies in Illinois 4,175
- The largest companies in Pennsylvania 3,110
- The largest companies in Georgia 2,632
- The largest companies in Ohio 2,618
- The largest companies in New Jersey 2,569
- The largest companies in Virginia 2,503
- The largest companies in Michigan 2,346
- The largest companies in North Carolina 2,174
- The largest companies in Alabama 1,806
- The largest companies in Washington State 1,785
- The largest companies in Colorado 1,774
- The largest companies in Minnesota 1,700
- The largest companies in Maryland 1,527
- The largest companies in Wisconsin 1,482
- The largest companies in Arizona 1,449
- The largest companies in New York 6,920
- The largest companies in San Francisco 2,030
- The largest companies in Houston 1,791
- The largest companies in Chicago 1,668