| # | Company | Employees |
|---|---|---|
| 1 |
QVCcareers.qvcgrp.com
The company provides a unique shopping experience through a diverse range of products, engaging stories, and exceptional customer service worldwide |
9,215 |
| 2 | 7,614 | |
| 3 |
West Chester University of Pennsylvaniawcupa.edu
A top regional public university offering over 180 undergraduate and graduate programs, focusing on teaching, research, and community service |
3,581 |
| 4 |
HSNqvcgrp.com
A leading interactive retailer offering a curated assortment of exclusive products and top brand names, providing a unique shopping experience through entertainment and industry experts |
3,570 |
| 5 |
QVC Groupqurateretailgroup.com
This company specializes in video-driven shopping experiences across various platforms, combining entertainment with commerce to engage discerning shoppers worldwide |
2,717 |
| 6 |
Core States Groupcore-states.com
A collaborative team offering architecture, interior design, engineering, program management, and construction solutions nationwide, focused on facilitating a remarkable customer experience |
2,134 |
| 7 |
New Era Technologyneweratech.com
Global managed technology service provider offering collaboration, networking, security, cloud, and professional services across diverse industries worldwide. |
2,072 |
| 8 |
Independent Projectsipro4u.com
A full-service marketing agency that prioritizes clients' needs, offering strategic marketing plans, consulting, training, and creative services like website design and social media management |
1,784 |
| 9 |
Penn Medicine Chester County Hospitalchestercountyhospital.org
Delivering compassionate and innovative healthcare as part of a leading health system for over 125 years, offering new treatment options |
1,701 |
| 10 |
Weston Solutions, Inc.westonsolutions.com
A national environmental and infrastructure services firm providing excellence in remediation, compliance, water management, infrastructure improvements, and more for various clients |
1,459 |
| 11 |
Lithko Contractinglithko.com
A full-service concrete contracting company focused on building local teams, exceeding customer expectations, and delivering high-quality concrete construction projects |
1,390 |
| 12 |
Contech Engineered Solutionsconteches.com
Contech offers innovative and cost-effective site solutions including bridges, drainage, erosion control, and stormwater management products across North America |
1,379 |
| 13 |
A. Duie Pyle, Inc.aduiepyle.com
Family-owned logistics company providing LTL, dedicated fleet, warehousing, distribution, port services, and third-party logistics in Northeast region. |
1,318 |
| 14 |
E Tech Groupetechgroup.com
A leading engineering and system integration firm providing automation solutions to various industries with a team of over 450 engineers |
1,010 |
| 15 |
Keystone Foodskeystonefoods.com
Global food services company supplying high-quality animal protein products to consumer brands worldwide with a focus on sustainability and corporate social responsibility |
1,006 |
| 16 |
County of Chesterchesco.org
The company provides Chester County demographics information through their website chescoorg/3995/Demographics |
1,005 |
| 17 |
SAP
This company provides management consulting services to help organizations improve their performance and achieve their strategic objectives |
804 |
| 18 |
Lasko Productslasko.com
Manufacturing trusted home comfort products for over 100 years, focusing on innovation, quality, and value to improve everyday life |
661 |
| 19 |
EBS Healthcarethesteppingstonesgroup.com
A national provider of therapeutic, behavioral, autism, nursing, and educational services for children in school, home, and community settings |
607 |
| 20 |
Crescentcrescentway.com
A leading outsourcing partner for Consumer Packaged Goods companies, offering in-store program development, supply chain management, and full supply network competencies |
577 |
| 21 | 554 | |
| 22 |
BGRpackbgr.com
This company stands out by offering expertise in supply chain, packaging, and automation to help optimize performance through warehousing, custom services, and data-driven programs |
527 |
| 23 |
Trewtrewautomation.com
Manufacturing and integrating automated material handling solutions and software for retail, e-commerce, distribution, and parcel industries, including sortation, conveyors, robotics, and AS/RS. |
523 |
| 24 |
ClarkDietrichclarkdietrich.com
National manufacturer of construction materials, offering complete building solutions with a focus on quality lath and steel framing systems Operating 13 manufacturing facilities and 4 engineering offices |
508 |
| 25 |
YMCA of Greater Brandywineymcagbw.org
A community-focused association offering life-changing programs for individuals of all ages to build healthy mind, body, and spirit in Chester County, Pennsylvania |
478 |
| 26 |
OmniCableomnicable.com
Premier redistributor of wire, cable, electrical products, and value-added services for distributors, ensuring operational excellence and partnership approach since 1977 |
477 |
| 27 |
Nobel Learning Communitiesspringeducationgroup.com
A network of 180+ private schools offering exceptional preschools, K-8 schools, and private high schools with support from skilled education experts |
470 |
| 28 |
UC Health West Chester Hospitalwestchesterhospital.uchealth.com
A member of UC Health, this hospital in West Chester is committed to providing excellent and compassionate healthcare to the community |
464 |
| 29 |
Portescapportescap.com
Design, manufacture, and deliver premium miniature electronic motors and components, addressing critical motion challenges across various industries from medical to aerospace. |
452 |
| 30 |
Venerablevenerable.com
Privately held company managing legacy variable annuity business, focused on growth through acquisition with experienced investors and a strong employee-centric culture |
451 |
| 31 |
Planesteamplanes.com
This company operates as an agent for United Van Lines, offering moving, transportation, warehousing, logistics, and project management services on local, national, and international levels |
424 |
| 32 |
AFC Industriesafcind.com
Supply chain management solutions provider for fasteners and assembly components, offering Vendor Managed Inventory, Stock and Release programs, Light Assembly, Kitting, and Private Labeling services |
386 |
| 33 | 361 | |
| 34 |
Krapf Group - School Bus and Transportationkrapfbus.com
Family-owned transportation company operating over 2,500 buses, providing contracted school bus, public transit, and motorcoach services in multiple states. |
350 |
| 35 |
PiMPgetPiMP.org
The PiMP team develops cutting-edge cryptocurrency mining software with superior support, offering a comprehensive and easy-to-use platform for miners |
342 |
| 36 |
Westtown Schoolwesttown.edu
A private, Quaker Pre-K -12th grade school offering a college preparatory curriculum focused on critical thinking, collaboration, service, and social action |
318 |
| 37 |
STP Investment Servicesstpis.com
STP Investment Services offers scalable, transparent middle and back office solutions for investment managers, funds, and plan sponsors, enabling focus on core business objectives |
314 |
| 38 |
Crane 1 Servicescrane1.com
A company dedicated to creating a safe and customer-friendly culture, prioritizing safety and customer service as key values in its mission |
309 |
| 39 |
Senneca Holdingssenneca.com
A diversified holding company focused on the specialty door industry, overseeing operations, allocating resources, improving performance, and seeking acquisition opportunities to strengthen and diversify its portfolio |
279 |
| 40 |
Haas Group Internationalincora.com
Provider of chemical supply chain management services to various industries such as aerospace, military, automotive, energy, pharmaceutical, and electronics Owned by Wesco Aircraft Holdings, Inc |
249 |
| 41 |
Advantage RNadvantagern.com
Joint Commission-certified travel nurse staffing company providing RNs and Allied professionals for 6-13+ week assignments Multiple awards for exceptional service |
219 |
| 42 |
Aventura Health Groupaventurahg.com
The company provides top quality, round-the-clock medical care and a comfortable home-like environment for residents to thrive and celebrate life's milestones together |
186 |
| 43 |
Ascensionascensionpress.com
A faith-formation apostolate providing effective and engaging Catholic study programs, books, and resources to parishes, schools, organizations, and individuals |
179 |
| 44 |
ThreeBond International, Inc.threebond.com
A global leader in industrial adhesives and sealants technology with strong customer service, offering innovative solutions to manufacturers worldwide |
174 |
| 45 |
SentriLocksentrilock.com
A leading electronic lockbox manufacturer and service provider for the Real Estate industry, offering advanced products, mobile app access, and award-winning customer service |
173 |
| 46 |
RCF Groupthercfgroup.com
RCF Group is a diverse team passionate about creating innovative spaces and delivering top-notch solutions in furniture, interiors, and facilities services |
167 |
| 47 |
Pole/Zero Corporationmpgdover.com
Global provider of RF interference mitigation products, electronic components, and subsystems for mission-critical applications, part of a diversified manufacturer delivering innovative solutions worldwide |
164 |
| 48 |
Centinel Spinecentinelspine.com
Global leader in medical devices for cervical and lumbar spinal disease, offering clinically-proven total disc replacement technology with multiple motion-preserving solutions |
162 |
| 49 |
Busy Bee Cleaning Companybusybeecleaningcompany.com
Residential cleaning service providing weekly, biweekly, monthly, and one-time cleaning programs with all supplies and equipment included Bonded, insured, and award-winning |
160 |
| 50 |
Daicel Chiral Technologieschiraltech.com
This company is a global leader in chromatography products for the life sciences industry, providing achiral and chiral stationary phases for analysis and purification |
157 |
| 51 |
Children's Dental Healthchildrensdentalhealth.com
Specializing in pediatric dental care, we provide engaging, educational services to children throughout Pennsylvania to promote healthy smiles from infancy through adolescence |
152 |
| 52 |
MC Tank Transportmctank.com
Family-owned bulk chemical transportation company established in 1956 Specializing in safe, efficient, and time-sensitive delivery of specialty chemicals and acids with competitive pricing |
97 |
| 53 |
Comstar Technologies (Acquired by New Era Technology 2022)neweratech.com
An innovative technology ally specializing in customized solutions to maximize profitability, catalyze growth, and mitigate risk for businesses #TechTransformation |
93 |
| 54 |
TSS Technologiestsstech.com
Provider of turnkey manufacturing solutions for various industries, offering custom automation, systems integration, contract engineering, and more with a partnership approach |
90 |
| 55 |
Acero Precisionaceroprecision.com
A leading OEM specializing in precision engineered components, utilizing the latest technologies and skilled personnel to ensure high quality products |
84 |
| 56 |
Systeconsystecon.com
A leading manufacturer of modular utility systems, offering custom solutions like central plants, controls, and patented systems for global projects |
64 |
| 57 |
Meradiameradia.com
A leading operations and technology consulting firm for global investment management, specializing in optimizing processes, analytics, and reporting for institutional asset managers and financial companies |
61 |
| 58 |
Kencor, LLC Elevator Systemskencorelevator.com
A local full-service elevator company with four generations of experience, specializing in maintenance, modernization, repair, and installation in various states |
42 |
| 59 |
Winelco Inc.winelco.com
This company offers comprehensive environmental solutions for water and wastewater treatment in residential, commercial, and municipal settings, from design to maintenance |
21 |
| 60 |
Golden Valley Farms Coffee Roastersgoldenvalleyfarms.com
Family-owned artisan coffee roaster with over 30 years of experience Specializes in Shade-Grown, Triple Certified, and Fair Trade coffees with national distribution and branding services |
19 |
| 61 |
Chester County Department of Community Developmentchesco.org
This organization offers housing, neighborhood enhancement, workforce programs, and social services to promote safe, stable, diverse communities for residents |
17 |
| 62 |
Ruthman Companiesruthmancompanies.com
This company specializes in industrial pumps, hydraulic relief valves, and machine tools to meet various pumping challenges across different industries worldwide |
17 |
| 63 |
Classic Kitchens, Inc.classickitchenspa.com
Specializing in kitchen and bath remodeling, we offer Medallion Cabinetry products for all budgets, in-house design services, and direct sales to trade professionals |
10 |
| 64 |
BISON USA Corpbison-america.com
A leading Polish manufacturer of machine tool accessories serving various industries globally, with a US headquarters based in Cincinnati, Ohio |
8 |
| 65 |
myofficeopsmyofficeops.com
The company offers high-quality administrative services including accounting, payroll, human resources, executive services, and information technology to support small businesses |
7 |
| 66 |
Grateful Investments
Specializing in providing venture capital funding for startups and early-stage companies to support their growth and success in the market |
5 |
| 67 |
Kinetic Representatives, LLCkineticreps.com
This company specializes in bringing together manufacturers, retailers, and consumers in the Outdoor, Ski, Surf, Apparel, and Footwear industries through unique and innovative strategies |
4 |
| 68 |
Chemtech International Incchemtech-us.com
Global solutions provider for manufacturing needs in various industries, with emphasis on sustainability Specializing in wastewater testing, pharmaceutical manufacturing, gas valves, and spill containment |
3 |
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.
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