The 42 largest companies in Watertown (2026 list)

#	Company	Industry	Headquarters	Employees	Founded
1	VHB vhb.com A diverse team of professionals dedicated to improving mobility, enhancing communities, and delivering sustainable solutions for a more resilient future	Civil Engineering	🇺🇸 Watertown	2,812	1979
2	Samaritan Medical Center samaritanhealth.com A community medical center offering a full range of inpatient, outpatient, and long-term care services with a focus on quality, compassion, and safety	Hospitals and Health Care	🇺🇸 Watertown	1,135	1881
3	AbleLight ablelight.org A national leader in empowering individuals with disabilities through comprehensive supports such as housing, employment, financial services, and assistive technology	Hospitals and Health Care	🇺🇸 Watertown	1,081	n/a
4	Perkins perkins.org The organization provides educational services for children and young adults with multiple disabilities and visual impairments, promoting disability inclusion and lifelong learning	Education	🇺🇸 Watertown	981	1829
5	Watertown Public Schools watertown.k12.ma.us The organization provides educational services from preschool to twelfth grade, including academic, after school, summer, and athletic programs	Primary and Secondary Education	🇺🇸 Watertown	761	n/a
6	Bethesda Lutheran Communities ablelight.org AbleLight provides life-changing services for individuals with intellectual and developmental disabilities, helping them achieve their full potential Follow their LinkedIn page for updates	Hospitals and Health Care	🇺🇸 Watertown	750	1904
7	Wurth Elektronik we-online.com Global partner for electronic and electromechanical components, offering technical expertise, design support, and dependable service to overcome engineering challenges and bring ideas to life.	Appliances, Electrical, and Electronics Manufacturing	🇺🇸 Watertown	578	1987
8	Jefferson Community College sunyjefferson.edu A higher education institution within SUNY system offering a variety of career and transfer programs, including online degrees and partnerships with other universities	Higher Education	🇺🇸 Watertown	563	1961
9	Siemon siemon.com A global industry leader in high-quality IT infrastructure solutions, specializing in cabling systems, data center power, and Intelligent Infrastructure Management	Telecommunications	🇺🇸 Watertown	508	1903
10	Dynamo Software dynamosoftware.com A leading provider of configurable, cloud-based investment management platforms for fund managers, institutional investors, and service providers in the alternative investments industry	Financial Services	🇺🇸 Watertown	459	n/a
11	New York Air Brake nyab.com A leading innovator serving the rail industry since 1890, committed to providing quality products at a cost-effective price, with a focus on new technology and efficiency	Railroad Equipment Manufacturing	🇺🇸 Watertown	453	n/a
12	Bosch Home Comfort USA bosch-homecomfort.com A leading provider of heating, cooling, and hot water systems, offering tankless water heaters, boilers, heat pump systems, controls, and accessories for energy-efficient living	HVAC and Refrigeration Equipment Manufacturing	🇺🇸 Watertown	451	1886
13	Liaison liaisonedu.com This company provides solutions for higher education institutions to identify, recruit, and enroll students through improved outreach, application, and enrollment processes	Education Administration Programs	🇺🇸 Watertown	441	1990
14	Terex Utilities terex.com Global manufacturer of aerial devices and digger derricks for the electric utility industry, offering innovative solutions, quality service, and support across North America	Machinery Manufacturing	🇺🇸 Watertown	439	n/a
15	ButcherBox butcherbox.com A company founded in 2015 committed to making high-quality, sustainable meat accessible while promoting animal welfare, supporting farmers, and upholding diversity and inclusion	Food and Beverage Services	🇺🇸 Watertown	413	2015
16	Watertown Regional Medical Center watertownregional.com A regional medical center offering personalized healthcare services with state-of-the-art facilities, advanced technology, and a focus on local primary and specialty care	Hospitals and Health Care	🇺🇸 Watertown	373	n/a
17	Wis-Pak, Inc.wis-pak.com A cooperative in the soft drink industry, with 35 shareholders owning 65 Pepsi-Cola franchises across multiple states and expanding through acquisitions	Food and Beverage Services	🇺🇸 Watertown	346	1969
18	Maranatha Baptist University mbu.edu This organization focuses on equipping leaders for ministry in the church and beyond, aiming to bring glory to God	Higher Education	🇺🇸 Watertown	326	1968
19	Kymera Therapeutics kymeratx.com A clinical-stage biotechnology company pioneering targeted protein degradation to develop medicines for immunological diseases and oncology, improving patient outcomes	Biotechnology Research	🇺🇸 Watertown	302	2016
20	EyePoint eyepoint.bio Developing and commercializing innovative treatments for serious retinal diseases, specifically wet age-related macular degeneration and diabetic macular edema, using sustained delivery technology.	Biotechnology Research	🇺🇸 Watertown	262	n/a
21	Fisher Barton fisherbarton.com A manufacturing innovation partner specializing in high-wear components, offering proprietary heat treating and thermal spray solutions for various industries	Machinery Manufacturing	🇺🇸 Watertown	233	1973
22	The Arc Jefferson - St. Lawrence thearcjslc.org The organization provides a variety of services for individuals with diverse needs to support them in achieving their aspirations and enhancing their lives	Individual and Family Services	🇺🇸 Watertown	202	1959
23	Forma Therapeutics (Now Novo Nordisk)novonordisk.com A clinical-stage biopharmaceutical company focused on developing novel therapeutics for rare hematologic diseases and cancers, aiming to transform patients' lives	Biotechnology Research	🇺🇸 Watertown	182	2007
24	Creative Community Living Services, Inc.cclswi.org Non-profit organization supporting individuals in establishing community supports to achieve independence while preserving dignity and rights	Individual and Family Services	🇺🇸 Watertown	180	1973
25	HTP biochempeg.com The company specializes in producing PEGlinkers, although specific details of their products or services are not mentioned	Biotechnology Research	🇺🇸 Watertown	178	2010
26	Treeline treeline.bio Developing innovative precision medicines to improve outcomes for cancer patients and those with other serious conditions	Biotechnology Research	🇺🇸 Watertown	172	n/a
27	EdAssist, a Bright Horizons Solution at Work edassist.com This company specializes in managing education assistance programs for organizations, focusing on maximizing talent, driving recruitment, growth, retention, and engagement through strategic investments	Education Administration Programs	🇺🇸 Watertown	171	2004
28	Recipharm Advanced Bio recipharm-ab.com A visionary CDMO founded in 2019, specializing in developing and manufacturing complex biological drugs and innovative therapies for commercial launch	Pharmaceutical Manufacturing	🇺🇸 Watertown	171	2022
29	Disc Medicine discmedicine.com Biopharmaceutical company focused on developing innovative therapies for hematologic disorders by targeting fundamental pathways of red blood cell biology	Biotechnology Research	🇺🇸 Watertown	169	n/a
30	Dakota Bodies dakotabodies.com A leading manufacturer of utility and service truck bodies with a strong focus on growth, innovation, and customer satisfaction through new technologies and techniques	Motor Vehicle Manufacturing	🇺🇸 Watertown	156	1997
31	Global Steering Systems, LLC.globalsteering.com A leading supplier of high-quality steering products, with a global headquarters in Watertown, Connecticut, known for their superior products	Motor Vehicle Manufacturing	🇺🇸 Watertown	155	n/a
32	Children's Home of Jefferson County Providing opportunities for growth and success for children, adults, and families through community support networks to lead healthy lives	Individual and Family Services	🇺🇸 Watertown	154	1859
33	ITW Shakeproof shakeproof.com A leading designer and manufacturer of high-quality engineered hardware solutions with a history dating back to the 1920s	Turned Products and Fastener Manufacturing	🇺🇸 Watertown	154	1923
34	Enanta Pharmaceuticals enanta.com Specializing in drug discovery for virology and immunology, with a focus on RSV and CSU, Enanta develops small molecule drugs like glecaprevir for various infections	Biotechnology Research	🇺🇸 Watertown	148	1995
35	Crystal Rock - Water, Coffee & Office Supplies crystalrock.com This company distributes water, coffee, office supplies, and other refreshment products in the Northeast, emphasizing high standards, innovation, and environmental commitment	Retail Office Equipment	🇺🇸 Watertown	147	1914
36	Utitec, Inc.utitec.com A US-based company manufacturing precision deep drawn tubular and flat stamped components, offering engineering support and material selection services for various applications	Medical Equipment Manufacturing	🇺🇸 Watertown	34	1981
37	TRACS tracs.net A sports marketing firm specializing in designing and managing branded engagements worldwide, prioritizing passion and performance for partners and participants	Advertising Services	🇺🇸 Watertown	29	1983
38	Berres Brothers Coffee Roasters, Inc.berresbrothers.com A small Midwest-based company roasting and distributing over 100 varieties of flavored and non-flavored coffee nationwide, with an attached cafe and gift options	Food and Beverage Services	🇺🇸 Watertown	19	1992
39	United Professional Advisors, LLC unitedprofessionaladvisors.com A financial services company dedicated to empowering clients to fulfill their financial promises through innovative plan development and trusted guidance	Financial Services	🇺🇸 Watertown	17	2005
40	Morgia Wealth Management morgiawm.com A client-focused financial advisory firm, acting as fiduciary advisors to guide individuals, families, and organizations towards their financial goals with trust and integrity	Financial Services	🇺🇸 Watertown	11	1968
41	ReModern Builders, LLC remodernbuilders.com A Boston-based company specializing in remodeling, restoring, and renovating homes with a focus on excellence, fine craftsmanship, and creative solutions Hiring creative talent	Construction	🇺🇸 Watertown	3	2016
42	Rainbow International of Watertown rainbowwatertown.com Professional property cleanup, restoration, and reconstruction services in Jefferson, Lewis, and St Lawrence counties, including Fort Drum area Specializing in water damage, mold, and fire restoration	Consumer Services	🇺🇸 Watertown	2	2015

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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