The 38 largest companies in Somerville (2026 list)

#	Company	Industry	Headquarters	Employees	Founded
1	Mass General Brigham massgeneralbrigham.org Integrated academic health system providing patient care, research, teaching, and community services through hospitals, insurance, and specialized medical centers.	Hospitals and Health Care	🇺🇸 Somerville	17,890	n/a
2	Partners HealthCare partners.org Integrated healthcare system offering coordinated care, high-quality services, research, teaching, and community outreach through academic medical centers and various healthcare entities	Hospitals and Health Care	🇺🇸 Somerville	6,751	1994
3	Recorded Future recordedfuture.com Provides real-time threat intelligence from open, dark web, and technical sources, enabling clients to reduce risk and secure business operations.	Computer and Network Security	🇺🇸 Somerville	1,151	2009
4	Triumvirate Environmental triumvirate.com Sustainable environmental solutions for Life Sciences, Healthcare, Education, and Industrial sectors, specializing in waste management, EHS consulting, decontamination, and facility services	Environmental Services	🇺🇸 Somerville	1,096	1988
5	SmartBear smartbear.com Leading provider of trusted tools for software development teams worldwide, offering solutions for test management, automation, API development, and application stability	Software Development	🇺🇸 Somerville	957	n/a
6	Form Energy formenergy.com Development and manufacturing of cost-effective multi-day energy storage systems to ensure a clean, secure, and reliable electric grid during prolonged stress periods.	Manufacturing	🇺🇸 Somerville	847	2017
7	Somerville Public Schools somerville.k12.ma.us A leading school district in Massachusetts with high growth in ELA and Math, focusing on student success and community engagement	Education Administration Programs	🇺🇸 Somerville	831	n/a
8	Formlabs formlabs.com A global provider of professional 3D printing solutions, offering a range of advanced printers, materials, and software for engineers, designers, and manufacturers worldwide	Computers and Electronics Manufacturing	🇺🇸 Somerville	779	2011
9	City of Somerville somervillema.gov Governing a diverse urban community while managing public programs, infrastructure, and services for residents, local businesses, and a thriving local arts scene.	Government Administration	🇺🇸 Somerville	733	n/a
10	Modelo modelo.io A platform for architects and designers using complex 3D design software, focused on enhancing collaboration, presentation, and project management efficiency	Software Development	🇺🇸 Somerville	715	2014
11	Cataldo Ambulance Service Inc.cataldoambulance.com A leading EMS provider offering emergency & routine medical services, ambulance & wheelchair transportation, education, mobile health programs, and COVID-19 vaccinations/testing in Massachusetts	Hospitals and Health Care	🇺🇸 Somerville	684	1977
12	The Herb Chambers Companies herbchambers.com A leading automotive dealership group in the US, offering a wide range of high-quality automobile brands and providing top-notch sales and repair services	Motor Vehicle Manufacturing	🇺🇸 Somerville	663	1985
13	Neighborhood Health Plan nhp.org NCQA-accredited health plan offering affordable coverage to commercial and MassHealth members, with a focus on health equity and personalized care management	Insurance	🇺🇸 Somerville	503	1986
14	Mass General Brigham Health Plan massgeneralbrighamhealthplan.org A health plan company focused on members' needs, provider connectivity, and continuous improvement with a partnership with Mass General Brigham	Insurance	🇺🇸 Somerville	475	n/a
15	Tulip Interfaces tulip.co Provides AI-enabled connected apps and composable platform to improve quality, efficiency, traceability, and real-time operational insights across industries.	Software Development	🇺🇸 Somerville	383	2012
16	Robert Wood Johnson University Hospital Somerset rwjbh.org Providing New Jersey residents with access to high quality medical services at Robert Wood Johnson University Hospital Somerset	Hospitals and Health Care	🇺🇸 Somerville	382	n/a
17	Matlen Silver matlensilver.com Provider of talent and technology solutions for Fortune 500 companies, delivering success through experienced professionals and innovative solutions for over 40 years	IT Services and IT Consulting	🇺🇸 Somerville	346	1980
18	Generate:Biomedicines generatebiomedicines.com Innovating in generative biology to develop innovative therapeutics that drive breakthroughs in the field	Biotechnology Research	🇺🇸 Somerville	335	n/a
19	bluebird bio linkedin.com This company focuses on developing curative gene therapies for severe genetic diseases like sickle cell, thalassemia, and cerebral adrenoleukodystrophy	Biotechnology Research	🇺🇸 Somerville	316	1993
20	dancker dancker.com A company specializing in creating innovative workspaces that enhance collaboration, productivity, and wellbeing by integrating architectural, furniture, technology, and logistical solutions	Building Finishing Contractors	🇺🇸 Somerville	301	1829
21	oneZero Financial Systems onezero.com Technology company developing trading solutions for financial institutions globally with high reliability, scalability, and performance, handling billions in transactions daily	IT Services and IT Consulting	🇺🇸 Somerville	189	2009
22	Ciberspring ciberspring.com Ciberspring specializes in bridging technology and marketing, using complex customer data to create personalized digital content and drive revenue	Technology, Information and Internet	🇺🇸 Somerville	183	2003
23	Fayette Industrial Sanitation Solutions fayette.com Specializing in contract cleaning solutions for the food industry, with a focus on plant sanitation and adherence to quality and safety standards	Food and Beverage Services	🇺🇸 Somerville	172	1994
24	Velir bit.ly A data-driven digital agency creating engaging digital experiences and marketing strategies, focusing on audience connections through personalized insights	Professional Services	🇺🇸 Somerville	164	2000
25	Somerville Public Schools (NJ)somervillenjk12.org The company focuses on personalized student assessment and mentorship programs, academic achievement, workforce skill development, and internship opportunities in various industries	Primary and Secondary Education	🇺🇸 Somerville	163	n/a
26	Motivated Security Services, Inc.motivatedsecurity.com A leading managed security company offering people and technology-based security programs for top companies and facilities nationwide	Security and Investigations	🇺🇸 Somerville	163	n/a
27	Steel Sports steelsports.com Steel Sports Inc is a subsidiary dedicated to acquiring, building, and strengthening a network of sports, training, education, entertainment, and lifestyle businesses	Spectator Sports	🇺🇸 Somerville	162	2011
28	Candlewick Press linktr.ee A Massachusetts-based publisher committed to authors and readers worldwide, emphasizing creativity, storytelling, and high-quality books for all ages and interests	Book and Periodical Publishing	🇺🇸 Somerville	161	1991
29	Overstory overstory.com Building AI grid resilience software, combining satellites and machine learning to help utilities prevent outages, reduce wildfire threats, and provide reliable power.	Software Development	🇺🇸 Somerville	150	2018
30	Immaculata High School immaculatahighschool.org A Catholic high school focuses on academic, spiritual, and social growth through Faith, Scholarship, Service, and Friendship, promoting moral responsibility	Primary and Secondary Education	🇺🇸 Somerville	147	1962
31	BasisTech basistech.com This company works with entrepreneurs to refine ideas, attract talent, access capital, and accelerate growth for high-tech startups	Software Development	🇺🇸 Somerville	54	1995
32	Upstream Tech upstream.tech Builds software tools for land and water decision-making, using remote sensing, computer science, and machine learning for planning and monitoring platforms.	Software Development	🇺🇸 Somerville	38	2016
33	Rendever rendever.com This company utilizes virtual reality to combat social isolation by facilitating shared experiences, fostering personal connections, and reducing depression and loneliness	Wellness and Fitness Services	🇺🇸 Somerville	34	2016
34	Ohara Corporation oharacorp.com Manufacturer of precision optical glasses/materials including UV transmitting glasses, Fused Silica, Chalcogenide glasses, crystalline materials, and various optical materials in different forms	Glass, Ceramics and Concrete Manufacturing	🇺🇸 Somerville	31	1981
35	AlphaStruxure alphastruxure.com Energy as a Service provider specializing in designing, building, owning, and operating customized energy infrastructure, including microgrids, with a focus on sustainability and cost stability	Renewables & Environment	🇺🇸 Somerville	26	2019
36	Cambridge Premier Realty LLC cambridgepremierrealty.com A full-service residential brokerage agency specializing in personalized real estate services, assisting clients in buying, selling, renting, and tenant placement	Real Estate	🇺🇸 Somerville	13	n/a
37	Simon Law Group LLC (Official)simonattorneys.com A New Jersey law firm with experienced attorneys providing legal services in family law, estate planning, real estate, criminal defense, personal injury, bankruptcy, and more	Law Practice	🇺🇸 Somerville	10	2000
38	McNally, Yaros, Kaczinski & Lime, LLC mykl-law.com A team of experienced attorneys specializing in estate, real estate, land use, government, transactional, and corporate law, providing integrated and client-focused legal services	Law Practice	🇺🇸 Somerville	8	2016

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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.

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 Massachusetts 3,093
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 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