| # | Company | Employees |
|---|---|---|
| 1 |
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 |
| 2 |
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 |
| 3 |
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 |
| 4 |
Quantiphiquantiphi.com
An AI-first digital engineering company that solves complex business problems with industry experience, cloud, data engineering, and cutting-edge AI research |
4,105 |
| 5 |
Digital Federal Credit Uniondcu.org
A top-20 credit union with over one million members offering innovative technology, focusing on member experience excellence and promoting financial success |
1,317 |
| 6 |
Sumitomo Pharma America, Inc.sumitomo-pharma.com
Science-driven biopharmaceutical company focusing on therapeutic breakthroughs in psychiatry, neurology, oncology, urology, women鈥檚 health, rare disease, and cell/gene therapies |
1,161 |
| 7 |
Ken's Foodskensfoods.com
Family owned company producing high quality dressings, sauces and marinades, with over 400 varieties available as well as custom-made options |
978 |
| 8 |
Sunovion Pharmaceuticalssunovion.com
Global biopharmaceutical company specializing in innovative treatments for serious neurological and psychiatric conditions through research, development, and commercialization. |
915 |
| 9 | 818 | |
| 10 |
Doble Engineeringdoble.com
Providing diagnostics and engineering expertise for the energy industry, specializing in condition monitoring, enterprise asset management, in-service testing, protection testing, security, and compliance solutions |
782 |
| 11 |
Lifelinelifeline.com
The company is a leading provider of medical alert systems, offering services to ensure safety and support for subscribers |
754 |
| 12 |
Candela Medicalcandelamedical.com
A global medical aesthetic device company focusing on safety, efficacy, and trust, providing energy-based solutions for various medical-aesthetic applications since 1970 |
603 |
| 13 |
Communication Technology Services (CTS)cts1.com
CTS provides custom, carrier-grade in-building and campus connectivity solutions for enterprises and mobile network operators, offering unmatched customer service and vendor-agnostic designs |
544 |
| 14 |
Hardware Specialty Co., Inc.hardwarespecialty.com
A leading distributor of commercial and military fasteners, electronic components, and electro-mechanical components worldwide, offering Managed Inventory Programs and Value-Added Services |
481 |
| 15 |
OneShieldoneshield.com
Provider of business solutions for P&C insurers and MGAs, offering cloud-based platforms for policy management, billing, claims, rating, and analytics |
465 |
| 16 |
ExaGridexagrid.com
Provides tiered backup storage with fast disk-cache landing zone, long-term retention, scale-out architecture, and ransomware recovery features. |
459 |
| 17 |
PLMplmnet.com
A specialized electric power engineering consulting and design firm with a solid industry reputation, serving a wide range of clients in the energy sector |
410 |
| 18 | 397 | |
| 19 |
Avaniaavaniaclinical.com
Provides expert clinical research services for medical devices, novel technologies, and combination products from feasibility to post-market trials. |
371 |
| 20 |
MARLBOROUGH PUBLIC SCHOOLSmps-edu.org
This school district serves 4,704 students through a range of educational programs from early childhood through high school |
342 |
| 21 |
Globe Life American Income Division: Moore Organizationlinktr.ee
Provider of union-label insurance products and benefits worldwide, offering life and supplemental insurance plans to support hard-working families with protection and peace of mind |
339 |
| 22 |
Web Industrieswebindustries.com
Precision converting and outsource manufacturing services for aerospace, energy, wire, commercial, consumer, and medical markets with flexible material solutions. |
337 |
| 23 |
Wind River Environmentalwrenvironmental.com
Septic, grease, and drain service experts committed to extending septic system life, protecting health, offering 24/7 emergency service, and environmental preservation through maintenance programs |
323 |
| 24 |
TTA (The Training Associates)thetrainingassociates.com
TTA is a women-owned leader in Learning & Development, providing talent, solutions, and training services to organizations of all sizes |
255 |
| 25 |
BDSbdsdoc.com
Boston Document Systems offers cutting-edge document processing systems and services in Boston, providing custom-tailored solutions for businesses to improve efficiency and productivity |
254 |
| 26 |
Vention Medicalventionmedical.com
A company specializing in medical technology and device manufacturing services, acquired by Nordson Corporation and MedPlast, Inc in 2017 |
246 |
| 27 |
Maxtonmaxtontech.com
A leading designer and provider of specialized structures and facilities for top wireless carriers and various industries, offering comprehensive services from design to installation |
207 |
| 28 |
ECIeci-rx.com
Consulting firm specialized in providing tailored solutions to life sciences companies, covering the entire product lifecycle with expertise in FDA regulations and compliance management |
206 |
| 29 |
Boundless, Inc.boundlessinc.com
A residential solar sales company that provides tailored solar solutions, exceeds customer expectations, and prioritizes honesty, relationships, and high standards |
197 |
| 30 |
ICON plc (formerly Aptiv Solutions)iconplc.com
Global provider of drug development solutions and services specializing in strategic development, management, and analysis of clinical development programs for pharmaceutical, biotech, and medical device industries |
190 |
| 31 |
Boston Technology Corporationboston-technology.com
Leading IT services company enabling digital transformation through AI-powered software development, cloud infrastructure modernization, healthcare solutions, and strategic tech partnerships for successful business outcomes |
180 |
| 32 |
CloudWave, Healthcare IT Solutionsgocloudwave.com
A healthcare data security expert providing cloud, cybersecurity, and managed services to healthcare organizations, supporting multiple EHR, clinical, and enterprise applications |
179 |
| 33 | 176 | |
| 34 |
Persivia Inc.persivia.com
Persivia provides an AI-driven platform for managing value-based care models, integrating data sources for real-time insights and clinical decision support |
165 |
| 35 |
VIOC - Metrolube Companiesvioc.com
A growing franchise specializing in Valvoline Instant Oil Change facilities, founded in 2002 to develop and operate under franchise agreements |
164 |
| 36 |
Main Street Bankbankmainstreet.com
A local independent bank in Massachusetts serving communities with innovative financial products, focusing on education and financial wellbeing since 1860 |
159 |
| 37 |
Passion Dentalpassiondentalservices.com
Premier dental group offering support and growth to dentists and hygienists, providing state-of-the-art oral health care with ethical practices |
156 |
| 38 |
CITY OF MARLBOROUGHmarlborough-ma.gov
Government administration company located in Marlborough, Massachusetts, responsible for overseeing the operations and services for the local community |
155 |
| 39 |
IEP Technologiesieptechnologies.com
Global provider of explosion protection solutions for process industries, with expertise in detecting, suppressing, isolating, and venting combustible dust or vapor explosions |
149 |
| 40 |
AMSA Charter Schoolamsacs.org
This company fosters a diverse environment where children excel in math, science, and technology, preparing them for success in a high-tech workforce |
146 |
| 41 |
Cloudy Bay Vineyardscloudybay.com
Company produces high-quality wines from Marlborough, New Zealand, including Sauvignon Blanc, Chardonnay, Pinot Noir, Pelorus m茅thode traditionnelle, Te Koko, and Te Wahi |
88 |
| 42 |
Endless Energygoendlessenergy.com
An industry leader in energy solutions, committed to innovation and sustainability through comprehensive consulting and custom renewable energy solutions |
82 |
| 43 |
Energy Federationefi.org
Industry leader in delivering energy efficiency solutions through online marketplaces, incentive programs, and product bundles for Utilities and ESCOs across North America |
79 |
| 44 |
HBOX Digitalhboxdigital.com
Global technology company offering customized software solutions, digital marketing services, and SaaS model to empower businesses through innovative and scalable solutions worldwide |
61 |
| 45 |
Weetabix North America / Barbara's Bakery Inc.weetabix.com
Leading British breakfast cereal manufacturer offering top-selling brands, private label products, and organic options, focused on providing healthy and nutritious options globally |
48 |
| 46 |
Boston Bytebostonbyte.com
A collaborative team of 60+ skilled professionals providing technology solutions, product development, and business problem-solving for large corporations for a decade |
27 |
| 47 |
ScerIS, Inc.sceris.com
ScerIS offers a next-generation digital transformation platform, ETCETERA, for seamless robotic process automation, application development, workflow management, and analytics for various sectors |
24 |
| 48 |
International Computerware, Inc.iciamerica.com
Global infrastructure consulting and integration firm specializing in cloud enablement Offers process-driven technology solutions and innovative methodology for infrastructure challenges |
8 |
| 49 |
Kitchen Living LLCkitchenlivingdesign.com
Specializing in transforming kitchens into inviting spaces for families to gather, Kitchen Living, LLC helps bring your vision to life |
4 |
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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