The 32 largest companies in Windsor (2026 list)

#	Company	Industry	Headquarters	Employees	Founded
1	SS&C Technologies ssctech.com Provider of cloud-based software and solutions for financial and healthcare industries, serving over 22,000 companies globally.	Software Development	🇺🇸 Windsor	27,478	1986
2	TRC Companies, Inc.trccompanies.com Providing advisory, consulting, construction, engineering, and management services to help clients adapt and achieve sustainable, impactful results.	Environmental Services	🇺🇸 Windsor	7,463	1969
3	DST Systems ssctech.com A global fintech company offering specialized software solutions and services for insurance, asset management, and other financial industries, with a focus on operational excellence	IT Services and IT Consulting	🇺🇸 Windsor	3,116	n/a
4	Barnes Aerospace barnesaero.com Global manufacturer of precision components and assemblies for turbine engines, airframes, and industrial gas turbines Also provides MRO services and aerospace aftermarket spare parts	Aviation and Aerospace Component Manufacturing	🇺🇸 Windsor	1,645	n/a
5	SS&C Blue Prism blueprism.com Provides agentic automation software with AI, industry expertise, and governance for high-stakes environments in banking, healthcare, insurance, and asset management.	Software Development	🇺🇸 Windsor	1,050	n/a
6	BAPS Swaminarayan Sanstha baps.org A worldwide socio-spiritual organization promotes community service, peace, harmony, and character-building through Hindu principles, with a focus on youth development	Non-profit Organizations	🇺🇸 Windsor	1,021	1907
7	SS&C Eze advent.com Global provider of investment management software solutions optimizing operational and investment processes for financial and healthcare industries worldwide	Software Development	🇺🇸 Windsor	871	n/a
8	LIMRA limra.com A global organization providing research, consulting, and professional development services to insurance and financial companies worldwide, helping them improve marketing and distribution effectiveness	Financial Services	🇺🇸 Windsor	648	1916
9	DST Health ssctech.com The company provides pharmacy, healthcare administration, and health outcomes solutions to health plans, PBMs, and providers, optimizing clinical, operational, and financial outcomes	Software Development	🇺🇸 Windsor	577	n/a
10	Community Health Resources chrhealth.org A leading provider of behavioral health services in Connecticut, offering personalized care for mental illness, addiction, and trauma through community-based programs and expert staff	Mental Health Care	🇺🇸 Windsor	557	1966
11	Morris gotomorris.com Leading distributor in North America providing CNC machine tools, tooling, maintenance, financing, and engineering services to help manufacturers gain a competitive advantage globally	Manufacturing	🇺🇸 Windsor	502	1941
12	Windsor Public Schools windsorct.org A school district in Windsor, CT, serving nearly 4,000 students with diverse educational opportunities, technology integration, and strong community partnerships for educators	Primary and Secondary Education	🇺🇸 Windsor	458	n/a
13	Weld RE-4 School District weldre4.org A school district in Weld County values its employees, prioritizing professional development and offering competitive benefits to create a supportive community	Primary and Secondary Education	🇺🇸 Windsor	454	1870
14	Total Directional Services, LLC totaldirectional.com A privately owned company based in Windsor, CO, specializing in premium quality and reliable directional drilling services for optimal industry performance nationwide	Oil and Gas	🇺🇸 Windsor	368	2009
15	Resident Realty joinresidentrealty.com Real estate company providing agents with top technology for exemplary customer service at low cost, resulting in rapid growth and success	Real Estate	🇺🇸 Windsor	351	2000
16	The Loomis Chaffee School loomischaffee.org A prestigious New England boarding school offering a challenging academic program, close faculty-student bonds, and a diverse community preparing students for higher education	Primary and Secondary Education	🇺🇸 Windsor	332	n/a
17	Pine Environmental Services LLC pine-environmental.com The company is a leading provider of rental equipment for various industries with a focus on quality, calibration, technical support, and customized financial offerings	Environmental Services	🇺🇸 Windsor	329	1995
18	Bertie County Schools bertie.k12.nc.us Educational institution providing a supportive environment for students to develop academic, emotional, and social skills through tailored instructional strategies	Education Administration Programs	🇺🇸 Windsor	278	n/a
19	Community Solutions, Inc. (CSI)csi-online.org A nonprofit organization providing supervision, treatment, and individualized services to at-risk individuals to promote self-reliance and accountability in communities	Individual and Family Services	🇺🇸 Windsor	267	1962
20	EMCOR Services New England Mechanical nemsi.com Provides comprehensive mechanical, electrical, plumbing, sheetmetal, building automation, and facilities services for building construction and management, with a focus on customer satisfaction and quality	Facilities Services	🇺🇸 Windsor	179	n/a
21	Specialty Printing specialty.inc A leading manufacturer of diverse pressure sensitive labels for various industries, offering custom and stock solutions with a focus on innovation and quality	Printing Services	🇺🇸 Windsor	178	1978
22	Alliant Power parts.alliantpower.com Leading provider of premium engine repair components, specializing in fuel systems, turbochargers, and aftertreatment parts for on road, off road, and marine engines	Motor Vehicle Manufacturing	🇺🇸 Windsor	164	1961
23	Educational Playcare educationalplaycare.com A leader in high-quality childcare, providing educational programs for children from 6 weeks to 12 years old in Connecticut	Primary and Secondary Education	🇺🇸 Windsor	161	1986
24	Simon Pearce simonpearce.com This company creates handcrafted glassware and pottery using traditional techniques and the finest materials for a lifetime of daily use	Retail	🇺🇸 Windsor	160	1971
25	Town of Windsor Colorado windsorgov.com The Town of Windsor provides a safe and vibrant community in Northern Colorado, offering diverse business sectors and promoting quality development	Government Administration	🇺🇸 Windsor	158	1890
26	Aero Gear aerogear.com Specializing in gears and gearbox assemblies for the aerospace industry, offering superior product development with unique gear processing capabilities and excellent quality control	Aviation and Aerospace Component Manufacturing	🇺🇸 Windsor	100	1982
27	Pareto Technologies paretotechnologies.com An asset management and technology development firm utilizing systematic strategies and innovative approaches to make intelligent trading decisions and manage risk effectively	Financial Services	🇺🇸 Windsor	22	2019
28	Rogers & Young Insurance Services, LLC rogers-young.com An independent brokerage specializing in risk management solutions for clients nationwide, offering exceptional customer service and expertise in commercial, personal, and life insurance	Insurance	🇺🇸 Windsor	17	n/a
29	Baronet Coffee, Inc.baronetcoffee.com A coffee company with over 87 years of history, committed to providing high quality coffee and exceptional service to create loyal customers	Food and Beverage Services	🇺🇸 Windsor	16	1930
30	RECORE Energy recore.energy This company is transforming the way energy is sourced and utilized on a global scale	Utilities	🇺🇸 Windsor	7	2001
31	The ARM Group thearmgroup.com This company helps businesses assess, optimize, and build efficient technology plans to ensure growth, offering seamless design and support services	IT Services and IT Consulting	🇺🇸 Windsor	4	1987
32	Stäubli Electrical Connectors, Inc (formerly Multi-Contact USA)multi-contact-usa.com This company is an electrical/electronic manufacturing company located in Windsor, California, specializing in producing a wide range of products	Appliances, Electrical, and Electronics Manufacturing	🇺🇸 Windsor	4	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