This selection of large companies in Pennsylvania primarily features established players in chemical manufacturing and related industrial sectors. Companies like PPG, founded in 1883, specialize in paints and coatings, while Air Products, established in 1940, supplies industrial gases. FMC Corporation, also founded in 1883, focuses on agricultural chemicals, and Airgas, founded in 1982, distributes industrial and specialty gases. Other significant firms include Axalta, a global provider of performance coatings, and Howmet Aerospace, specializing in advanced engineered solutions for aerospace.
A notable pattern among these companies is their long-standing presence, with many founded in the late 19th or early 20th century, indicating a mature industrial base. Pittsburgh emerges as a significant hub, hosting the headquarters of several large corporations, including PPG, Alcoa, Howmet Aerospace, and United States Steel Corporation. This concentration points to a historical strength in heavy industry within the region.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 | 33,277 | ||||
| 2 |
Air Productsairproducts.com
Supplier of industrial gases serving over 250,000 customers in more than 50 countries worldwide with diverse applications. |
20,000 | |||
| 3 | 17,780 | ||||
| 4 |
FMC Corporationfmc.com
The company is dedicated to innovating sustainable technologies to protect crops, support farmers, and tackle agriculture's challenges using science |
11,986 | |||
| 5 |
Airgasairgas.com
A leading supplier of industrial, medical, and specialty gases, safety products, ammonia, and process chemicals, committed to improving customer performance |
10,444 | |||
| 6 |
Axaltaaxalta.com
A global provider of performance coatings for industrial, automotive, and refinish applications, focused on innovation for a sustainable future |
7,744 | |||
| 7 |
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 | |||
| 8 |
Coherent Corp.coherent.com
Development and delivery of breakthrough technologies and innovations for industrial, communications, electronics, and instrumentation market applications worldwide. |
7,389 | |||
| 9 |
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 | |||
| 10 |
Saint-Gobain North Americasaint-gobain-northamerica.com
A global leader in sustainable construction materials and services, dedicated to enhancing buildings' efficiency and reducing carbon emissions by 2050 |
5,971 | |||
| 11 |
Arconicarconic.com
A leading provider of aluminum products for automotive, aerospace, transportation, industrial, packaging, and construction markets, committed to innovation and advancement |
4,672 | |||
| 12 |
SUEZ - Water Technologies & Solutionswatertechnologies.com
Providing innovative solutions for industries, including water treatment and process optimization, to help businesses thrive and overcome challenges |
4,538 | |||
| 13 |
Graham Packaginggrahampackaging.com
A leader in sustainable packaging design, manufacturing, and sales for food, beverage, household, and automotive industries with global reach |
3,562 | |||
| 14 |
Quaker Houghtonhome.quakerhoughton.com
Global leader in industrial process fluids, serving advanced manufacturing industries with expertise in chemistry and engineering for efficient operations and future growth |
3,523 | |||
| 15 |
Carpenter Technology Corporationcarpentertechnology.com
Producer and distributor of premium specialty alloys and advanced materials for aerospace, transportation, medical, energy, and additive manufacturing applications. |
3,271 | |||
| 16 |
Armstrong World Industriesarmstrongceilings.com
Design and manufacture innovative ceiling and wall systems enhancing aesthetics, acoustics, well-being, and sustainability in various interior spaces. |
3,186 | |||
| 17 |
TekniPlextekni-plex.com
Global leader in healthcare and consumer product markets, providing innovative solutions through materials science and manufacturing technologies for a healthier, sustainable world |
2,042 | |||
| 18 |
Trinseotrinseo.com
A specialty material solutions provider partnering with companies to innovate and create sustainable products across various industries worldwide |
2,009 | |||
| 19 |
Industrial Coatingsppg.com
Global provider of advanced coatings, paints, and specialty materials focused on protecting and enhancing industrial products and landmarks. |
1,830 | |||
| 20 | 1,408 | ||||
| 21 |
Carlisle Construction Materialscarlisleconstructionmaterials.com
Manufacturer and supplier of roofing, insulation, waterproofing, and construction products for commercial and residential building markets. |
1,382 | |||
| 22 |
The Pittsburgh Paints Companypittsburghpaintsco.com
Manufactures and sells interior and exterior paints, stains, adhesives, sealants, and repair products for consumers and professionals. |
1,293 | |||
| 23 |
Aquatechaquatech.com
Global leader in water technology, specializing in desalination, water reuse, and zero liquid discharge solutions to reduce water and carbon footprint worldwide |
1,270 | |||
| 24 |
Greene Tweedgtweed.com
Global manufacturer of high-performance thermoplastics, composites, seals, and engineered components for industries like semiconductor, oil & gas, aerospace, defense, and pharmaceutical processing |
1,238 | |||
| 25 |
Colorconcolorcon.com
Develops, supplies, and supports formulated film coating systems, modified release technologies, core excipients, and functional packaging for the pharmaceutical industry. |
1,228 | |||
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. | |||||
| 26 |
PQ Corporationpq.com
A global provider of silicates, silicas, and derivative products for environmental improvements, consumer products, and personal safety, prioritizing sustainability |
1,169 | |||
| 27 |
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 | |||
| 28 |
Harsco Metals & Mineralsharsco-environmental.com
Harsco Metals & Minerals is now Harsco Environmental, focusing on sustainable solutions for waste management and resource recovery Visit their LinkedIn page |
1,020 | |||
| 29 |
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 | |||
| 30 |
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 | |||
| 31 |
Calgon Carbon Corporationcalgoncarbon.com
Activated carbon products for water, air, and environmental purification across more than 700 applications, leveraging over 80 years expertise. |
783 | |||
| 32 |
Brentwood Industries, Inc.brentwoodindustries.com
A leading provider of thermoformed plastic solutions for consumer, manufacturing, and environmental industries, specializing in custom products and innovative strategies |
733 | |||
| 33 |
AgroFreshagrofresh.com
AgroFresh empowers fresh produce businesses with science-based solutions to enhance quality, extend shelf life, prevent food waste, and preserve resources |
726 | |||
| 34 |
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 | |||
| 35 |
Buzzi Unicem USAbuzziunicemusa.com
A leading US cement manufacturer with 8 plants and 35 terminals, supplying cement to over 3,800 companies across 20 states |
709 | |||
| 36 |
Carmeuse Americascarmeuse.com
A leading manufacturer of lime and limestone products offering integrated services to optimize processes and provide solutions across various industries |
687 | |||
| 37 | 614 | ||||
| 38 |
Quaker Chemical Corporationhome.quakerhoughton.com
Global leader in industrial process fluids, serving steel, aluminum, automotive, aerospace, mining, and metalworking industries with a focus on efficiency and effectiveness |
606 | |||
| 39 |
Vitro Architectural Glassvitroglazings.com
A leading glass manufacturer in the Americas, specializing in residential and commercial construction markets, producing industry-leading glass brands |
522 | |||
| 40 |
CRC Industriescrcindustries.com
Production of specialty chemical products and formulations for maintenance, repair, and operations across automotive, industrial, electrical, marine, and aviation sectors worldwide. |
509 | |||
| 41 |
The Plastek Groupplastekgroup.com
A world-class manufacturer specializing in plastics packaging for various industries, providing services from design and development to molding, assembly, and decorating |
505 | |||
| 42 |
Houghton Internationalhome.quakerhoughton.com
Global leader in industrial process fluids serving steel, aluminum, automotive, aerospace, and metalworking industries with technical and business expertise. |
502 | |||
| 43 |
Fenner Precision Polymersfenner.com
Supplier of engineered polymer products and solutions for diverse industries including aerospace, manufacturing, agriculture, and 3D printing applications worldwide. |
501 | |||
| 44 |
Henry, a Carlisle Companyhenry.com
North American leader managing water, vapor, air, and energy flow from foundation to roof, enhancing energy efficiency and sustainability for buildings. |
486 | |||
| 45 |
NLMK USAus.nlmk.com
Leading producer of high-quality steel coils for construction, automotive, and heavy equipment industries in the US, offering specialty products and customized solutions |
438 | |||
| 46 |
Penn Color, Inc.penncolor.com
Global developer and manufacturer of color concentrates, masterbatches, additives, and pigment dispersions for various industries with a focus on innovation and customer satisfaction |
401 | |||
| 47 |
Restek Corporationrestek.com
Design and manufacture chromatography columns, sample preparation tools, standards, and accessories for environmental, food, pharmaceutical, and clinical industries. |
383 | |||
| 48 |
Tastepoint by IFFtastepoint.com
Tastepoint blends passion and technology to provide innovative taste solutions, creating delightful experiences for customers and consumers |
375 | |||
| 49 |
Solesissolesis.com
A market leader in biomaterials for life sciences, developing critical components for medical devices and single-use technologies Operates through four subsidiaries |
361 | |||
| 50 |
VEKA - North Americavekainc.com
A global leader in PVC/vinyl extrusion for windows, doors, fences, decks, and railings, offering technologically advanced materials for residential and commercial building applications |
355 | |||
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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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