The 25 largest companies in Amherst (2026 list)

#	Company	Industry	Headquarters	Employees	Founded
1	University of Massachusetts Amherst umass.edu A top-ranked teaching and research institution in western Massachusetts with about 28,500 students, part of the University of Massachusetts system	Higher Education	🇺🇸 Amherst	11,525	1863
2	CTG ctg.com CTG accelerates digital transformation by offering innovative solutions and services to achieve business performance, data-driven decision making, and reimagined customer experiences	IT Services and IT Consulting	🇺🇸 Amherst	3,092	n/a
3	Amherst College amherst.edu Provides liberal arts education with dynamic courses, mentorship, and community support to prepare students for future opportunities.	Higher Education	🇺🇸 Amherst	1,939	1821
4	Daemen University daemen.edu Private university offering undergraduate and graduate degrees, fostering creativity, ethical leadership, and community engagement through liberal arts education.	Higher Education	🇺🇸 Amherst	876	1947
5	Williamsville Central Schools williamsvillek12.org The company is the largest suburban school district in Western New York, empowering students to develop potential, assume leadership roles, and thrive globally	Primary and Secondary Education	🇺🇸 Amherst	860	n/a
6	Isenberg School of Management, UMass Amherst isenberg.umass.edu A top-accredited business school offering undergraduate business majors, MBA, MS, and PhD programs with a focus on real-world learning and networking opportunities	Higher Education	🇺🇸 Amherst	567	1947
7	Opta Group opta-group.com Supplier of engineered performance materials for basic materials, infrastructure, and specialty chemicals industries worldwide, focusing on high-performance solutions.	Chemical Manufacturing	🇺🇸 Amherst	543	1870
8	Allient allient.com A global company specializing in precision and customized products for various industries, including Aerospace, Medical, Agriculture, Industrial, Vehicles, and Electronics	Automation Machinery Manufacturing	🇺🇸 Amherst	527	n/a
9	Hampshire College hampshire.edu Innovative college in Amherst, Mass offering unique program of study, fostering critical thinking, experimentation, and producing successful alumni across various fields	Higher Education	🇺🇸 Amherst	508	1965
10	Amherst County Public Schools amherst.k12.va.us Amherst County Public Schools cultivates excellence in academics, career readiness, and citizenship for over 3900 students through dynamic education programs	Primary and Secondary Education	🇺🇸 Amherst	452	n/a
11	DENT Neurologic Institute dentinstitute.com A leading private practice group specializing in neurology and neurodiagnostics, offering compassionate patient care, cutting-edge technology, and valuable partnerships	Medical Practices	🇺🇸 Amherst	419	1963
12	Bison USA bisontransportusa.com A transportation company that provides reliable and safe shipping services for various types of cargo throughout North America	Truck Transportation	🇺🇸 Amherst	342	1980
13	OrthoLite ortholite.com A global leader in foam technology, creating innovative insoles for top footwear brands with a focus on comfort, performance, and sustainability	Manufacturing	🇺🇸 Amherst	326	1997
14	Amherst Exempted Village Schools amherstk12.org PreK-12 public schools in Amherst, Ohio providing excellence in academics, athletics, and fine arts for students Contact 440-988-4406 for more information	Education Administration Programs	🇺🇸 Amherst	318	n/a
15	MJ Peterson Real Estate mjpeterson.com A full-service real estate firm in Western New York since 1930, offering residential, commercial, rentals, relocation, and new builds services Trusted advisors for all real estate needs	Real Estate	🇺🇸 Amherst	274	1930
16	ARMOR-IIMAK North America armor-iimak.us A global leader in thermal transfer ribbons, offering a comprehensive range of products, exceptional customer care, and sustainable partnerships for variable information printing specialists #wearetheink	Printing Services	🇺🇸 Amherst	255	1983
17	Foundation Medical Partners snhproviders.org A multi-specialty medical group with over 300 providers offering primary, specialty, and immediate care across southern New Hampshire and northern Massachusetts, promoting innovative and collaborative healthcare	Medical Practices	🇺🇸 Amherst	199	n/a
18	Prospect Engine LLC prospectengine.com The company helps businesses accelerate sales through inbound and outbound lead generation, utilizing SEO, branding, LinkedIn outreach, and data-driven solutions	Marketing Services	🇺🇸 Amherst	181	2020
19	Town of Amherst, MA amherstma.gov A diverse and inclusive community in Western Massachusetts, offering high-level government services, quality education, and respect for history and culture	Government Administration	🇺🇸 Amherst	171	1759
20	Nordson Industrial Coating Systems nordson.com The company provides equipment for precise application and curing in manufacturing processes, helping customers produce high-quality products and enhance competitiveness	Machinery Manufacturing	🇺🇸 Amherst	159	1954
21	Twin City Ambulance tcaems.com Established in 1955, this private ambulance service in Western New York offers EMS, paramedic services, and coverage for special events in Niagara County	Public Safety	🇺🇸 Amherst	148	1955
22	Valley Medical Group, P.C.vmgma.com Provider-owned multi-specialty group providing care for over 55,000 patients at four Pioneer Valley locations	Hospitals and Health Care	🇺🇸 Amherst	147	2000
23	Practicefirst Medical Management Solutions pracfirst.com Leader in medical practice management services including billing, credentialing, coding, compliance, auditing, bookkeeping, tax preparation, and revenue cycle optimization with industry expertise	Hospitals and Health Care	🇺🇸 Amherst	40	1960
24	GoodPaper Ventures goodpaperventures.com A company in the venture capital industry that invests in startups and provides funding and support for growth and expansion	Venture Capital and Private Equity Principals	🇺🇸 Amherst	4	n/a
25	All Seasons Builders allseasonsbuild.com A home remodeling company with 25 years of experience, specializing in transforming homes into dream spaces with honesty, collaboration, and accessibility updates	Construction	🇺🇸 Amherst	3	n/a

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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