| # | Company | Employees |
|---|---|---|
| 1 |
Project Management Institutepmi.org
Leading professional organization offering project management certifications, resources, knowledge, and networking for project professionals worldwide since 1969. |
6,165 |
| 2 |
Trinity Health Mid-Atlantictrinityhealthma.org
A regional health system in the Greater Philadelphia Area with multiple hospitals, part of Trinity Health of Livonia, Michigan |
2,158 |
| 3 |
SAP BusinessObjectssap.com
A subsidiary of SAP AG offering solutions within the SAP Analytics portfolio Visit the SAP Technology page for news and information |
1,334 |
| 4 |
SupplyOne, Inc.supplyone.com
Offers comprehensive packaging management programs and managed services to simplify processes, guarantee savings, and increase efficiency across various industries. |
1,083 |
| 5 |
ALG Vacations庐alg.www.vaxvacationaccess.com
A leading leisure travel provider offering a wide range of destinations and accommodations worldwide, serving over three million passengers annually |
1,082 |
| 6 |
Apple Leisure Grouphyatt.com
A vertically integrated hospitality company in the US travel industry, offering charter flights and all-inclusive vacation packages to popular destinations worldwide |
960 |
| 7 |
Xanitos, Inc.xanitos.com
Specializing in hospital housekeeping and support services, including patient transport, linen management, and healthcare janitorial services across the US |
591 |
| 8 | 492 | |
| 9 |
Apple Vacationsalg.www.vaxvacationaccess.com
Providing quality "beginning-to-end" vacation experiences with great service, convenience, and value for customers for over 40 years |
482 |
| 10 |
Delphinus Engineering, Inc.delphinus.com
A professional services company founded in 1994, providing expert services in Cyber Operations, Marine Engineering, Marine Services, and Business Management |
466 |
| 11 |
AMResortshyattinclusivecollection.com
Provide sales, marketing, and brand management services to eight luxury resort brands, offering premium accommodations and extraordinary inclusions in multiple desirable locations worldwide |
460 |
| 12 |
The Episcopal Academyepiscopalacademy.org
A diverse community dedicated to nurturing boys and girls holistically, promoting purpose, faith, and integrity through challenging education at all levels |
381 |
| 13 |
Marple Newtown School Districtmnsd.org
A K-12 public school district serving the community of Marple Newtown |
377 |
| 14 |
Creative Financial Group1creative.com
A company founded in 1955, providing comprehensive financial and non-financial services to entrepreneurs, businesses, individuals, and multi-generational family businesses |
365 |
| 15 |
SAP Americassap.com
Provides enterprise software solutions that enhance business processes, including ERP, CRM, financial management, and supply chain management for various industries. |
336 |
| 16 |
Dept of Telecommunications and Postal Servicesdtps.gov.za
Telecommunications company based in Pennsylvania, offering postal and telecommunication services from its location in Newtown Square |
323 |
| 17 |
Atorusatorusresearch.com
Delivering insights and efficiencies from clinical data through innovative analytics solutions that automate, analyze, and visualize data to drive confident decision-making |
188 |
| 18 |
Aronimink Golf Clubaronimink.org
Renowned golf course and historic clubhouse providing premier sporting facilities, hosting major championships, weddings, and elite social events in the Philadelphia area. |
181 |
| 19 |
Dunwoody Villagedunwoody.org
A not-for-profit organization providing residential and healthcare services to age-qualified individuals, prioritizing dignity, respect, and quality of life in a safe environment |
176 |
| 20 |
GMH Communitieslinktr.ee
A real estate company specializing in acquiring, developing, and managing exceptional living communities across the United States with proven expertise and innovative solutions |
171 |
| 21 |
USI Affinityusi.com
This company offers innovative insurance solutions to drive business growth through sales, marketing, and administration, catering to over 400 associations nationwide |
166 |
| 22 |
Graham Partnersgrahampartners.net
Private investment group specializing in technology-driven companies revolutionizing advanced manufacturing, leading to product substitutions, raw materials conversions, and market disruptions |
163 |
| 23 |
White Horse Village Inc.whitehorsevillage.org
A non-profit lifecare community for individuals 62 and older, offering personalized retirement lifestyles and comprehensive healthcare services on-site |
155 |
| 24 |
PMOGA - PMO Global Alliancepmoga.pmi.org
PMO Global Alliance (PMOGA) is a community under PMI dedicated to fostering professional growth for PMOs and PMO professionals worldwide |
149 |
| 25 |
Eastern Controlseasterncontrols.com
A leading Mid-Atlantic distributor of control valves, instrumentation, and more, offering solutions for various industries with a focus on technical support and service |
147 |
| 26 |
Logan Capital Management, Inc.logancapital.com
Employee-owned investment management firm specializing in growth, value, international, and fixed income strategies for institutional and private clients, prioritizing high-quality personal service |
39 |
| 27 |
Rainer & Companyrainer.com
A regional CPA firm in Pennsylvania providing comprehensive tax, audit, and consulting services to businesses, organizations, and individuals since 1954 |
26 |
| 28 |
NewSquare Capital, LLCnewsquarecapital.com
Providing investments that pursue and protect wealth through differentiated portfolios and industry-leading services, guided by signals from the market |
20 |
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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