The companies listed here are primarily large-scale manufacturers based in Pittsburgh, with a focus on industrial materials, transportation, and specialized components. Key players include PPG, which develops paints and coatings; Wabtec Corporation, a provider of equipment and services for rail and marine transport; Viatris, a global healthcare company specializing in pharmaceuticals; and Alcoa, a leader in bauxite, alumina, and aluminum products. Howmet Aerospace provides advanced engineered solutions for aerospace, while United States Steel Corporation focuses on steel solutions.
A notable pattern among these companies is their long-standing presence and significant workforce, indicating established industrial operations. Many were founded in the late 19th or early 20th century, such as Wabtec Corporation (1869), PPG (1883), and Alcoa (1888), highlighting a rich industrial heritage in the Pittsburgh area.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 | 33,277 | ||||
| 2 |
Wabtec Corporationwabteccorp.com
Provider of equipment, systems, digital solutions, and services for freight rail, transit, mining, industrial, and marine transportation sectors. |
27,000 | |||
| 3 |
Viatrisviatris.com
Global healthcare company providing extensive medicine portfolio and supply chain to deliver high-quality medicines addressing diverse health needs worldwide. |
17,886 | |||
| 4 | 17,780 | ||||
| 5 |
Howmet Aerospacehowmet.com
A global provider of advanced engineered solutions for aerospace and transportation industries, specializing in jet engine components, aerospace fastening systems, and titanium structural parts |
7,402 | |||
| 6 |
United States Steel Corporationussteel.com
Developing and delivering profitable, next-generation steel solutions focused on safety and meeting current and future customer needs. |
6,794 | |||
| 7 |
Kennametalkennametal.com
A global industrial technology leader specializing in advanced materials innovation, tooling, and wear-resistant solutions to enhance productivity for various industries |
6,659 | |||
| 8 |
Excelitas Technologies Corp.excelitas.com
Provider of advanced photonic technologies specializing in sensing, detection, imaging, optics, and specialty illumination for diverse global industries. |
3,129 | |||
| 9 |
Matthews Internationalmatw.com
Global provider of precision industrial technologies and memorialization products, serving industries and funeral homes with innovative, efficient solutions. |
2,226 | |||
| 10 |
Industrial Coatingsppg.com
Global provider of advanced coatings, paints, and specialty materials focused on protecting and enhancing industrial products and landmarks. |
1,830 | |||
| 11 |
Koppers Inc.koppers.com
A global wood preservation technology company creating environmentally responsible solutions for various industries, with a focus on safety and sustainability |
1,080 | |||
| 12 | 1,028 | ||||
| 13 |
Liberty Tire Recycling, LLClibertytire.com
Reclaims over four billion pounds of scrap tires annually, transforming waste into sustainable products through a network of North American processing facilities. |
927 | |||
| 14 |
SMS group USAsms-group.com
A leader in providing new equipment, maintenance, and spare parts services for metals producers in North America and globally |
919 | |||
| 15 |
HarbisonWalker Internationalthinkhwi.com
A global leader in refractory products delivering solutions to industries worldwide with over 150 years of excellence in performance and value |
809 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
Aerotech, Inc.aerotech.com
This company specializes in designing and manufacturing precision motion control systems for various industries and research institutions worldwide |
760 | |||
| 17 |
Industrial Scientificindsci.com
Innovative company designs gas detection products to protect workers globally, pioneering technologies for detecting and responding to hazardous conditions in real time |
755 | |||
| 18 |
JENNMARjennmar.com
Global leader in ground control technology for mining, tunneling, and civil construction industries, offering a wide range of quality products and services worldwide |
724 | |||
| 19 |
LB Fosterlbfoster.com
A leading provider of materials for transportation, construction, recreation, and agriculture projects, offering engineering, manufacturing, distribution, and service solutions globally |
692 | |||
| 20 |
Carmeuse Americascarmeuse.com
A leading manufacturer of lime and limestone products offering integrated services to optimize processes and provide solutions across various industries |
687 | |||
| 21 |
Chromaloxchromalox.com
Innovative developer of advanced thermal technologies for industrial heating applications worldwide, with a focus on exceeding specifications and reducing operating costs |
682 | |||
| 22 |
ZOLL Cardiac Management Solutionscardiac.zoll.com
Provider of innovative technologies improving insights and outcomes in various cardiac care paths, focusing on cardiac management solutions |
674 | |||
| 23 |
Westinghouse Electric Corporationwestinghouse.com
Providing a wide range of dependable and innovative quality products and services aimed at improving everyday life for customers. |
590 | |||
| 24 |
Pittsburgh Glass Worksvitro.com
Global leader in OEM automotive glass manufacturing with 13 locations in US, Canada, and Poland, emphasizing innovation and growth through recent acquisitions and advancements |
513 | |||
| 25 |
Forms+Surfacesforms-surfaces.com
Design and manufacture of architectural surfaces, site furnishings, lighting, and elevator interiors for public spaces like airports, parks, and diverse commercial environments. |
406 | |||
| 26 |
Krystal Biotech, Inc.krystalbio.com
This company specializes in developing genetic medicines to address urgent medical needs, aiming to bring innovative solutions to patients |
310 | |||
| 27 |
Benshaw, Inc.benshaw.com
A global leader in designing, developing, and manufacturing critical motor controls and drives for harsh environments since its establishment in 1983 |
192 | |||
| 28 |
Medradmedrad.com
Developing high-performing products since 1964 for accurate patient diagnosis and quality care, supported by exceptional customer service worldwide |
185 | |||
| 29 |
HICO Americahicoamerica.com
Delivers energy infrastructure solutions, including transformers, STATCOM, GIS, and HVDC systems, for utilities, developers, and data centers across North America. |
183 | |||
| 30 |
Red Valve Companyredvalve.com
Global leader in innovative pinch and check valve products, elastomers, and engineered systems for tough flow control challenges in various industries |
112 | |||
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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 Nov 12, 2026.
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The same list elsewhere
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