| # | Company | Employees |
|---|---|---|
| 1 |
Ricoh USA, Inc.ricoh-usa.com
Provide information management and digital services combining people, processes, and technology to enhance business agility and unlock insights. |
18,369 |
| 2 |
West Pharmaceutical Serviceswestpharma.com
provider of high-quality injectable components and devices ensuring safe, effective delivery and containment of medicines worldwide |
6,268 |
| 3 |
Bentley Systemsbentley.com
Innovative software for infrastructure engineering, design, construction, and operations, advancing global economy and environment with industry-leading solutions in multiple sectors worldwide |
5,633 |
| 4 | 1,156 | |
| 5 |
West Chester Area School Districtwcasd.net
Educational institution serving a diverse student body in Chester County, providing K-12 instruction, special education programs, and partnerships with the community |
849 |
| 6 |
Frontage Laboratories, Incfrontagelab.com
Provides comprehensive science-driven and quality-focused services including drug discovery, preclinical safety, formulation, manufacturing, bioanalytical, and clinical trials for pharmaceutical development. |
700 |
| 7 |
Citadel Credit Unioncitadelbanking.com
Not-for-profit credit union providing financial services, expert guidance, and community support to members across Greater Philadelphia region. |
662 |
| 8 |
Genzeongenzeon.com
Genzeon delivers advanced technology solutions for healthcare and retail clients, specializing in automation, security, compliance, and cloud services Vision: Dream Big, Deliver Excellence |
615 |
| 9 |
TW Metals LLCtwmetals.com
Leading specialty metal supplier, offers diverse extrusions, fittings, pipe, tube, rod/bar, sheet, and plate in various metals, including Stainless Steel, Aluminum, Nickel, Titanium. |
603 |
| 10 |
CCRES Educational and Behavioral Health Servicesccres.org
A non-profit organization providing educational and behavioral health services, including Wraparound services for children and adolescents with mental health diagnoses in four counties |
563 |
| 11 |
AGI (Analytical Graphics, Inc.)agi.com
Develops modeling and analysis software for engineers in aerospace and defense industries, providing accurate insights and visual simulations for informed decision-making |
477 |
| 12 |
World Travel, Inc.worldtravelinc.com
Global mid-market corporate travel management company, offering superior service, technology, consulting, and customization for corporate transient, groups, meetings, and leisure travel |
452 |
| 13 |
Cohesivecohesivesolutions.com
The company offers digital engineering, asset management, and service optimization solutions using data, AI, and digital technology to enhance operations for long-term sustainable results |
384 |
| 14 |
Collegium Charter Schoolcollegiumcharter.com
Tuition-free, independent K-12 public school providing families with choices for elementary and high school education |
379 |
| 15 |
Holcomb Behavioral Health Systems - A Chimes Companyholcombbhs.org
Provider of mental health, substance abuse, and developmental disability services in Pennsylvania, New Jersey, Delaware, and Maryland, promoting individual potential and dignity |
365 |
| 16 |
SID Global Solutionssidgs.com
Delivers AI-first, full-stack, end-to-end platform solutions and services, helping enterprises accelerate digital transformation, modernize technology, and unlock growth opportunities worldwide. |
345 |
| 17 |
ACR (AmerCareRoyal)weareacr.com
AmerCareRoyal is a leading supplier of over 6,000 disposable supplies for foodservice, janitorial, sanitation, education, hospitality, and healthcare industries with 200+ years of experience |
330 |
| 18 |
Automated Financial Systems, LLCafsvision.com
The company provides industry-leading lending and risk management solutions for financial institutions, offering a fully integrated commercial lending system with straight-through processing capabilities |
327 |
| 19 |
Spruce InfoTech Inc.spruceinfotech.com
Innovative IT firm offering cost-effective solutions to help businesses manage, transform, and maximize their IT investment while reducing costs |
315 |
| 20 |
Insight PA Cyber Charter Schoolinsightpaschool.org
Provides hands-on, engaging, and personalized K-12 education to full-time Pennsylvania students through Insight PA Cyber Charter School |
302 |
| 21 |
United Safety & Survivability Corporationusscgroup.com
Innovative company founded in 1984, specializing in safety and survivability solutions across various industries, uniting passions and ideas |
295 |
| 22 |
Ivystone Group LLCivystone.com
An authentic, experienced, and passionate team in the gift and home industry, building partnerships and curating trust through transparency and teamwork |
295 |
| 23 |
Actemium Avanceonavanceon.com
A systems integrator specializing in automation solutions for manufacturing and utility industries, with a focus on digital transformation and providing continuous support |
203 |
| 24 |
TalentQuest - An Energage Companyenergage.com
TalentQuest offers a comprehensive Talent Management and Development platform integrating behavioral science, analytics, and strategic services for individualized performance gains |
201 |
| 25 |
Pharmaron US Lab Servicesabsorption.com
Premier service provider in life sciences industry with broad range of research, development, and manufacturing capabilities for drug discovery and development worldwide |
186 |
| 26 |
J.W. Pepperjwpepper.com
A leading sheet music provider with over 140 years of experience, bringing music to customers worldwide through catalogs, website, and newsletters |
184 |
| 27 |
Allied Resources Technical Consultantsalliedresourcesstaffing.com
A national staffing firm specializing in Engineering & Construction services We prioritize building lasting partnerships, focusing on candidates' aspirations and client needs |
181 |
| 28 |
Springer Realty Groupjoinspringerrealtygroup.com
Assisting with real estate goals in PA, NJ, DE, and MD for buyers, sellers, and real estate agents Aiding in successful transactions |
151 |
| 29 |
NETZSCH Pumps & Systems USApumps-systems.netzsch.com
Manufacturing and supplying progressing cavity pumps, rotary lobe pumps, multiple screw pumps, peristaltic pumps, and other equipment for various industries globally |
69 |
| 30 |
Energy Management Systems, Incems3.com
A premier provider of energy and efficiency solutions for commercial and residential real estate, offering services such as submetering, utility management, and sustainability projects |
63 |
| 31 |
COMSPOCcomspoc.com
Commercial provider of space situational awareness software, delivering solutions to characterize and protect space objects, enabling secure SSA systems, producing actionable analysis, and offering space traffic management and space domain awareness services. |
46 |
| 32 |
Evolution Sustainability Groupevolutionsg.com
Energy management firm specializing in sustainability, energy efficiency, procurement, and analytics to maximize savings, mitigate risk, and enhance corporate sustainability practices |
34 |
| 33 |
East Coast Warehouse and Fulfillmenteastcoastwf.com
A leading warehousing and distribution company in the Mid-Atlantic region, offering storage, fulfillment, kitting, and global logistics services to diverse clients |
23 |
| 34 |
Opera Technologies, Inc.domains.atom.com
Innovative company leveraging technology and business expertise to help clients develop new products and services, specializing in IT, staffing, recruiting, and HR consulting |
19 |
| 35 |
The InTech Group, Inc.intech-group.com
Global IT consultancy providing premier services by leveraging a diverse workforce in 190+ countries, focusing on innovation, collaboration, and rapid results |
17 |
| 36 |
Roehrs & Company, Inc.roehrs.com
Established in 1923, specializing in commercial, personal, and benefits insurance for unique industries with a focus on building lasting relationships and providing personalized service |
17 |
| 37 |
Vertical Focus Incww1.verticalfocus.co
Provider of IT services to Fortune 500 clients, specializing in Enterprise, Cloud, Mobility, Analytics Focus on customer success through innovative solutions |
15 |
| 38 |
Syandussyandus.com
It offers an AI-powered platform for immersive learning experiences, enhancing decision-making skills through structured practice with virtual characters and mentors. |
11 |
Turn this list into pipeline
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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