The 26 largest companies in Canonsburg (2026 list)

#	Company	Industry	Headquarters	Employees	Founded
1	Mylan viatris.com Empowering people worldwide to live healthier at every stage of life through a merger with Upjohn, now known as Viatris	Pharmaceutical Manufacturing	🇺🇸 Canonsburg	15,198	n/a
2	Ansys ansys.com Delivering silicon design breakthroughs and IP to enable rapid innovation of AI-powered products across multiple high-tech industries.	Software Development	🇺🇸 Canonsburg	6,283	1970
3	EQT Corporation eqt.com A leading independent natural gas producer focused on responsible development in the Appalachian Basin, striving to create long-term value for stakeholders	Oil and Gas	🇺🇸 Canonsburg	1,809	1888
4	CentiMark Corporation centimark.com North America's largest commercial roofing contractor providing roof replacement, repairs, maintenance, inspections, snow removal, safety accessories, and digital tools for roof management	Construction	🇺🇸 Canonsburg	1,764	1968
5	CNX cnx.com Premier natural gas developer in Appalachia, prioritizing local resources to make a tangible impact on regional communities and beyond Producing low cost, low emission natural gas	Oil and Gas	🇺🇸 Canonsburg	1,413	1864
6	Aquatech aquatech.com Global leader in water technology, specializing in desalination, water reuse, and zero liquid discharge solutions to reduce water and carbon footprint worldwide	Environmental Services	🇺🇸 Canonsburg	1,270	1981
7	CONSOL Energy corenaturalresources.com A producer and exporter of high-quality bituminous thermal and metallurgical coal with productive longwall mining operations in the Northern Appalachian Basin	Mining	🇺🇸 Canonsburg	1,142	2017
8	Starline starlinepower.com Global leader in power distribution equipment, providing flexible and reliable solutions for data centers, retail, healthcare, education, and industrial facilities worldwide	Appliances, Electrical, and Electronics Manufacturing	🇺🇸 Canonsburg	457	1924
9	Cura Hospitality curahospitality.com A dining service provider since 1996, specializing in personalized programs for client needs, focusing on safety, satisfaction, and operational efficiency	Food and Beverage Services	🇺🇸 Canonsburg	426	1996
10	Elior Collegiate Dining elior-collegiatedining.com Aladdin Campus Dining provides student-driven, chef-prepared dining services for higher education institutions with a focus on local influences	Food and Beverage Services	🇺🇸 Canonsburg	364	n/a
11	Nicholson Construction nicholsonconstruction.com A nationally-renowned specialty general contractor with over 60 years of experience in geotechnical construction, offering expertise in deep foundations, earth retention, and ground treatment	Construction	🇺🇸 Canonsburg	363	1955
12	Lighthouse Electric Company, Inc.lighthouseelectric.com A family-owned electrical contracting firm specializing in innovative design and construction for commercial, mission critical, healthcare, and industrial projects	Construction	🇺🇸 Canonsburg	356	1984
13	QuestMark - Flooring and Concrete Polish Specialists questmarkflooring.com A division specializing in commercial flooring services, including installations, repairs, maintenance, coatings, and safety solutions for businesses across North America	Facilities Services	🇺🇸 Canonsburg	291	2002
14	Magna5 magna5.com Managed IT service provider offering network & server monitoring, backup & disaster recovery, cybersecurity, help desk, and SD-WAN solutions for businesses of all sizes	IT Services and IT Consulting	🇺🇸 Canonsburg	273	n/a
15	Connors Group connorsllc.com Consultancy specializing in workforce performance and productivity improvement, delivering sustainable operational success through proven methodologies and experienced consultants.	Business Consulting and Services	🇺🇸 Canonsburg	172	2008
16	Preferred Primary Care Physicians ppcp.org An independent primary care practice in Western Pennsylvania with 41 physicians, providing comprehensive healthcare services, clinical research, and advanced technologies	Medical Practices	🇺🇸 Canonsburg	164	1995
17	ROC Service Company LLC rocserviceco.com An employee-friendly energy services company with a focus on growth and operations in multiple regions	Oil and Gas	🇺🇸 Canonsburg	163	n/a
18	Universal Electric Corporation uecorp.com The company provides innovative power solutions, including trolley conductor systems and track busway, for various industries since 1924	Appliances, Electrical, and Electronics Manufacturing	🇺🇸 Canonsburg	146	1924
19	AUMA Actuators, Inc. - USA auma.com Manufacturer of electric valve actuators and gearboxes for water, power, oil & gas, and industrial markets Offers a range of actuators for various valves and dampers	Industrial Machinery Manufacturing	🇺🇸 Canonsburg	96	1976
20	Elior School Dining elior-schools.com A company dedicated to providing nutritious and delicious meals to students, continuously improving through research, nutrition expertise, and feedback from kids	Food and Beverage Services	🇺🇸 Canonsburg	72	n/a
21	METSO MINERALS INDUSTRIES, INC. A machinery company located in Canonsburg, Pennsylvania, specializing in industrial equipment for the minerals industries	Industrial Machinery Manufacturing	🇺🇸 Canonsburg	41	1990
22	American Destiny Real Estate Services adr-am.com This company offers national asset management solutions from delinquency to disposition, providing local representation to achieve strategic goals for clients	Real Estate	🇺🇸 Canonsburg	25	n/a
23	TallySoft tallysoft.com Retail management system offering Windows-based POS software with touch screen functionality for specialty retailers, restaurants, and resorts Includes inventory control, CRM, and 24/7 support	Software Development	🇺🇸 Canonsburg	18	1988
24	Cameron Insurance cameronins.com Providing life and mortgage protection insurance options to help individuals safeguard their loved ones	Insurance	🇺🇸 Canonsburg	14	2018
25	Ridge LLC ridgeco-llc.com Energy infrastructure solutions provider specializing in cost-effective, modernized solutions through transparent partnerships for improved project execution A new approach to midstream operations	Construction	🇺🇸 Canonsburg	9	2019
26	Fusion Investment Group, LLC fusioninv.com A privately owned asset management firm specializing in manufacturing quantitative global tactical strategies for generating alpha across asset classes	Investment Management	🇺🇸 Canonsburg	3	2006

Turn this list into pipeline

Tamtam finds the decision-makers at every company on a list like this one, with verified emails, phone numbers and the buying signals that tell you when to reach out.

Build your own list, free

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