| # | Company | Employees |
|---|---|---|
| 1 |
Bright Horizonsbrighthorizons.com
Provides on-site childcare, backup care, and education programs to support employees, enhance workplace culture, and develop critical skills. |
14,333 |
| 2 |
Atrius Healthatriushealth.org
Innovative healthcare leader offering connected care at 30 locations in eastern Massachusetts Focus on high-quality, patient-centered, cost-effective care for all |
3,776 |
| 3 |
Sonesta International Hotelssonesta.com
Leading global hotel company with 17 brands, 1200 hotels, 100K+ rooms across three continents, and award-winning loyalty program, offering unique and authentic guest experiences |
3,524 |
| 4 |
AlerisLifealerislife.com
AlerisLife provides financially flexible community living options and ancillary services for older adults, aiming to enhance quality of life through innovative solutions |
3,022 |
| 5 |
Five Star Senior Livingfivestarseniorliving.com
Provides various senior living options focusing on high service quality, community, independence, and a positive, empowering environment. |
2,956 |
| 6 |
Newton-Wellesley Hospitalnwh.org
A non-profit community hospital in Boston suburbs offering high-quality, safe, and efficient medical care with over a century of experience Affiliated with Mass General Brigham network |
2,753 |
| 7 |
CyberArkcyberark.com
Global leader in identity security. Offers comprehensive security for human and machine identities across applications, workforces, cloud, and DevOps lifecycle. |
2,712 |
| 8 |
Newton Public Schoolsnewton.k12.ma.us
A full inclusion school system in Newton, MA emphasizing excellence, equity, diversity, and strong community involvement, with high academic achievements |
1,641 |
| 9 |
Thorlabsthorlabs.com
A leading designer and manufacturer of photonics equipment for research, manufacturing, and biomedical applications with a global presence and extensive product portfolio |
1,567 |
| 10 |
Informa TechTargettechtarget.com
Leverages first-party data from technology websites to provide expert-led digital services, custom content, advertising, and demand generation for B2B tech buyers and sellers. |
1,518 |
| 11 |
Russian School of Mathematicsmathschool.com
An award-winning after-school math program for K-12 students that promotes understanding over memorization, empowering students to excel in mathematics |
1,394 |
| 12 |
Sittercitysittercity.com
Revolutionizing the child care industry through innovative technology solutions to simplify finding, hiring, and managing trustworthy child care providers for parents and caregivers |
1,024 |
| 13 |
RMR Grouprmrgroup.com
A leading US alternative asset management company specializing in commercial real estate with over $41 billion in assets under management |
872 |
| 14 |
Examityexamity.com
This company provides authentication and proctoring solutions for online exams, supporting over 500 universities and corporations globally |
816 |
| 15 |
Lasell Universitylasell.edu
A dynamic educational environment in Newton, MA, preparing students for success in the 21st century through challenges, opportunities, and professional connections |
776 |
| 16 |
Elements Therapeutic Massageetmnewton.com
This company in Newton, MA offers therapeutic massage services, tailored to individual needs, to promote wellness and alleviate pain and stress |
714 |
| 17 |
ClearView Healthcare Partnersclearviewhcp.com
A global strategy consulting firm specializing in the life science sector, providing practical recommendations for complex challenges to pharmaceutical, biotech, and medical companies worldwide |
690 |
| 18 |
Sussex County Community Collegesussex.edu
A public two-year community college offering a dynamic college experience with academic and occupational programs for diverse students, facilitating student success and lifelong learning opportunities |
684 |
| 19 |
Catawba County Governmentcatawbacountync.gov
This company in Catawba County fosters a community dedicated to hard work, tradition, improvement, and making a difference for residents and businesses |
654 |
| 20 |
Northlandnorthland.com
Private equity firm specializing in acquisition, development, ownership, and management of multifamily and mixed-use real estate assets. |
628 |
| 21 |
City of Newton, Massachusettsnewtonma.gov
The City of Newton, MA fosters growth, innovation, and community spirit, offering exciting career opportunities and promoting diversity and inclusion |
569 |
| 22 |
Wingate Livingwingateliving.com
Wingate Living is a family-owned company providing premier healthcare and hospitality for seniors in Massachusetts and Rhode Island, specializing in memory care and skilled nursing |
550 |
| 23 |
McGovern Automotive Groupmcgovernauto.com
A group of automotive professionals creating lasting customer relationships at 20 dealership locations, offering new and pre-owned vehicles, service appointments, and job opportunities |
449 |
| 24 |
William James Collegewilliamjames.edu
A leading mental health education institution preparing professionals to serve diverse populations through academic programs, field work, and community engagement initiatives |
431 |
| 25 |
Boston College Law Schoolbc.edu
A nationally renowned law school emphasizing professionalism, experiential learning, and service, with a focus on teaching and preparing students for successful legal careers |
427 |
| 26 |
Barkan Management Company, Inc.barkanco.com
Residential property management company with expertise in diverse market segments, specializing in high-quality services and long-lasting client relationships |
402 |
| 27 |
Wingate Companieswingatecompanies.com
A strategic multi-family real estate investing, consulting, and property management company with over 21,100+ apartments in 18 states |
363 |
| 28 |
Commodore Builderscommodorebuilders.com
Boston-based construction management firm founded in 2002, specializing in commercial, institutional, and public projects with a focus on client relationships and excellence |
342 |
| 29 |
Prairie View, Inc.prairieview.org
Regional behavioral health system providing services for all ages, including addiction and mental health care, with a focus on compassion and respect |
333 |
| 30 |
NMC Healthmynmchealth.org
Innovative health system providing education, information, and resources for residents of Harvey County and surrounding areas |
329 |
| 31 |
Karyopharm Therapeutics Inc.karyopharm.com
Develops and commercializes therapies, including XPOVIO, for various cancers by pioneering nuclear export inhibition science, focusing on hematologic and solid tumors. |
319 |
| 32 |
The Vernon Companyvernonpromotions.com
A pioneer in promotional advertising since 1902, we offer a wide range of customized products to help businesses grow and succeed |
314 |
| 33 |
Paytronixpaytronix.com
A Customer Experience Platform integrating loyalty, CRM, Order & Delivery, and AI-driven insights to create seamless experiences and drive revenue |
243 |
| 34 |
Kanda Softwarekandasoft.com
Custom software development company delivering high-quality, rapid development, and support solutions through a two-shore delivery mechanism, resulting in successful products for clients worldwide |
240 |
| 35 |
Newton Community School Districtnewton.k12.ia.us
The company's mission is to provide quality education for students and foster excellence in sportsmanship, integrity, competition, and community service for student-athletes |
199 |
| 36 |
Selling.comselling.com
It provides sales teams with tools for pipeline generation, accurate sales intelligence, outreach, and automation to enhance outbound growth. |
190 |
| 37 |
Wall Street Prepwallstreetprep.com
Global financial training firm established in 2004 by investment bankers Trains professionals and students, offering online training and instructor-led boot camps |
186 |
| 38 |
Environmental Health & Engineeringeheinc.com
Providing expert environmental, engineering, and health and safety services to healthcare, academic, research, and commercial clients nationwide. |
185 |
| 39 |
Mount Ida Collegemountida.edu
A diverse college offering career-focused programs in social sciences, humanities, and the arts, empowering students to achieve academically and contribute responsibly |
180 |
| 40 |
Health Advanceshealthadvances.com
A strategy consulting firm specializing in helping healthcare clients worldwide identify growth opportunities, develop innovative strategies, evaluate M&A objectives, and more |
180 |
| 41 |
Launchpad Venture Grouplaunchpadventuregroup.com
Boston-area angel investing group focused on early stage investments in tech and life sciences Largest in Northeast, active in US Learn more at website |
176 |
| 42 |
EmberHopeemberhope.org
A nonprofit, faith-based agency providing infrastructure and support to at-risk youth and families through foster care, residential, and counseling programs |
174 |
| 43 |
EveryAgeeveryage.org
EveryAge is a Christian ministry providing vibrant senior living, outreach programs, and healthcare services across North Carolina and Virginia |
174 |
| 44 | 170 | |
| 45 |
Summit Educational Groupmytutor.com
Customized One-on-One, In-Home tutoring services for test prep and academic subjects, driven by experienced tutors focused on student success |
167 |
| 46 |
Good Shepherd Community Caregscommunitycare.org
A trusted health care organization in Greater Boston providing hospice and palliative care, supporting individuals and families through the final stage of life with respect and dignity |
165 |
| 47 |
Smart Buildsmartbuildne.com
This company provides high-quality property improvement services for multifamily and commercial properties, prioritizing owner, manager, and tenant needs for maximum return and satisfaction |
161 |
| 48 |
Chapman Construction/Designchap-con.com
Construction management and consulting services for corporate, education, healthcare, and life-science clients Emphasizing teamwork, excellence, sustainability, and long-lasting relationships with clients |
158 |
| 49 |
Buntingbuntingmagnetics.com
A leading manufacturer of magnetic technology products serving various industries globally with precision magnetic materials, components, and equipment for over 60 years |
154 |
| 50 |
NetLinenetline.com
B2B buyer engagement platform providing real-time buyer intent data, lead generation, content syndication, and account-based marketing solutions. |
153 |
| 51 |
Centre Realty Group (CRG)centrerealtygroup.com
A socially responsible real estate company in Greater Boston offering honest and thoughtful services for sales, leasing, commercial, and property management clients |
153 |
| 52 |
Newton Country Day Schoolnewtoncountryday.org
Independent Catholic college preparatory school for girls, grades 5-12, fostering intellectual, emotional, and spiritual growth with focus on service, scholarship, and social justice |
151 |
| 53 |
BriefCam (Now Milestone)milestonesys.com
The company provides leading video analytics software for unlocking insights from video surveillance content, benefiting organizations across various industries for operational intelligence |
117 |
| 54 |
First Aid Beautyfirstaidbeauty.com
FAB offers skincare solutions with luxurious textures, dermatologist-tested formulas, and clean ingredients to help skin look and feel its best |
114 |
| 55 |
Park Aerospace Corp.parkelectro.com
Global leader in advanced composite prepregs for aircraft structures and interiors Manufacturing a variety of materials for aviation, aerospace, military, and specialty applications |
99 |
| 56 |
Feeturesfeetures.com
This company focuses on offering products to support runners and athletes in their pursuit of healthy, active lifestyles with personalized service and core values |
89 |
| 57 |
Capstone Behavioral Healthcarecapstonebh.com
A mental health center focused on providing support and care to the community through counseling, therapy, and mental health services |
69 |
| 58 |
Momentum Enterprisesthemomentumenterprises.com
An asset management company focused on community, family, and children, operating 17 businesses in New England, specializing in turning underperforming organizations into top-tier businesses |
37 |
| 59 |
Sportboxsportbox.com
A sports marketing firm with exclusive deals with MLB and Sears, offering licensing, advertising, marketing, and retail services for various product categories |
30 |
| 60 |
New England Insurance Groupnewenglandins.com
Specializing in insurance and risk management services to protect individuals and businesses from financial losses and potential liabilities |
29 |
| 61 |
Boston Development Groupbdg1.com
A company with a diverse real estate portfolio in commercial, retail, residential, hotels, and retirement facilities on the East Coast |
27 |
| 62 |
Dolan & Dolan, PAdolanlaw.com
A full-service law firm with a long history of professional service, specializing in various legal areas for individuals, corporations, municipalities, and more |
23 |
| 63 |
Matrix Usa Incmatrixusa.com
An electrical/electronic manufacturing company located in Newton, MA, specializing in producing a range of electrical and electronic products |
16 |
| 64 |
LeveragePointleveragepoint.com
It provides a SaaS platform for B2B companies to create and communicate value propositions, improving sales effectiveness and pricing outcomes. |
14 |
| 65 |
Castanea Partnerscastaneapartners.com
Private equity firm investing $15-$150 million in consumer brands across beauty, food, services, providing strategic and operational support. |
13 |
| 66 |
Devaney Energydevaneyenergy.com
A trusted leader in delivering residential and commercial energy solutions in Massachusetts since 1934, offering heating oil, propane, natural gas, electricity, and energy efficient equipment installations |
12 |
| 67 |
Derby and Company, Inc.derbyco.com
This company offers personalized investment management, retirement planning, and wealth protection, with an independent, objective, and integrated approach to financial independence |
9 |
| 68 |
TRIBINE Harvestertribine.com
US manufacturer of innovative grain harvesting solution with +300 years of experience, providing direct-to-customer machine addressing industry limitations for positive on-farm ROI |
8 |
| 69 |
Teranalyticsteranalytics.com
Tech company specializing in data analytics, AI, and Big Data Develops predictive machine learning solutions for various industries such as market forecasting, customer segmentation, and supply chain management |
4 |
| 70 |
Lemonade Lab, Incleomo.io
The company develops sports devices with smart sensors and analytics to provide data-driven feedback for athletes to improve performance |
3 |
| 71 |
Atlas Contracting, Inc.atlascontractingonline.com
Specializing in high-end residential construction, remodeling, and development, the company focuses on new construction projects with a commitment to quality |
2 |
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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