# The 50 largest chemical companies in Texas

Tamtam tracks 140 chemical companies headquartered in Texas. This list ranks the 50 largest by number of employees on LinkedIn, led by INEOS Oligomers, LyondellBasell and Celanese. Their median headcount is 1,626. Half of them were founded in 1970 or later. The most common headquarters are Houston (18), Irving (6) and Dallas (5).

These Texas-based companies are predominantly large firms in the chemical manufacturing and oil and gas sectors. Many were founded in the late 20th or early 21st century. For example, LyondellBasell, founded in 2007, produces innovative polymers, while Celanese, established in 1912, is a global leader in specialty material solutions. Huntsman Corporation, founded in 1970, focuses on sustainable chemical products, and Westlake, founded in 1986, manufactures petrochemicals and building products.

A clear pattern among these companies is their significant presence in the Houston area, with LyondellBasell, Westlake, CITGO, M-I SWACO US Land, and Motiva Enterprises LLC all headquartered there. This concentration highlights Houston as a major hub for the chemical and oil and gas industries within Texas. HF Sinclair and Oldcastle BuildingEnvelope are both based in Dallas, indicating another cluster of activity.

🇺🇸 Texas · 50 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [INEOS Oligomers](https://www.tamtam.ai/c/ineos-oligomers) (ineos.com)<br>A chemicals company headquartered in League City, Texas, specializing in oligomers and other chemical products for various industries | Chemical Manufacturing | 🇺🇸 League City | 26,000 |  |
| 2 | [LyondellBasell](https://www.tamtam.ai/c/lyondellbasell-houston) (lyondellbasell.com)<br>Leading global chemical company producing innovative polymers and polyolefins for sustainable transportation, food safety, clean water, and healthcare applications. | Chemical Manufacturing | 🇺🇸 Houston | 15,172 | 2007 |
| 3 | [Celanese](https://www.tamtam.ai/c/celanese) (celanese.com)<br>Global leader in chemistry, producing specialty material solutions for various industries through sustainable practices, innovation, and community involvement | Chemical Manufacturing | 🇺🇸 Irving | 7,348 | 1912 |
| 4 | [Huntsman Corporation](https://www.tamtam.ai/c/huntsman-corporation) (huntsman.com)<br>A global chemical company focused on shaping a sustainable future through innovative products that enhance energy efficiency and reduce waste and emissions | Chemical Manufacturing | 🇺🇸 The Woodlands | 6,996 | 1970 |
| 5 | [Westlake](https://www.tamtam.ai/c/westlake) (westlake.com)<br>Manufacturing and supplying petrochemicals, plastics, and building products globally, enhancing daily life through quality products and services. | Chemical Manufacturing | 🇺🇸 Houston | 6,574 | 1986 |
| 6 | [HF Sinclair](https://www.tamtam.ai/c/hf-sinclair) (hfsinclair.com)<br>Manufactures and sells light products, fuels, lubricants, and asphalt; operates refineries; markets motor fuel; produces renewable diesel and specialized lubricants. | Oil and Gas | 🇺🇸 Dallas | 6,426 |  |
| 7 | [ATI](https://www.tamtam.ai/c/ati-dallas) (atimaterials.com)<br>A global leader in materials science, providing solutions for extreme challenges in aerospace, defense, medical, and industrial applications worldwide | Aviation and Aerospace Component Manufacturing | 🇺🇸 Dallas | 5,959 | 1996 |
| 8 | [CITGO](https://www.tamtam.ai/c/citgo-houston) (citgo.com)<br>Operates refineries, terminals, and pipelines to transport and market fuels, lubricants, petrochemicals, and industrial products to retail outlets. | Oil and Gas | 🇺🇸 Houston | 5,326 | 1983 |
| 9 | [Chevron Phillips Chemical Company](https://www.tamtam.ai/c/chevron-phillips-chemical-company) (cpchem.com)<br>Leading global manufacturer and supplier of olefins, polyolefins, aromatics, specialty chemicals, plastic piping, and polymer resins with extensive facilities. | Chemical Manufacturing | 🇺🇸 Spring | 4,704 | 2000 |
| 10 | [M-I SWACO US Land](https://www.tamtam.ai/c/m-i-swaco-us-land) (slb.com)<br>An innovative company offering customized drilling fluid solutions through cutting-edge technology and a strong supply chain, focusing on client satisfaction and cost reduction | Oil and Gas | 🇺🇸 Houston | 3,109 | 2005 |
| 11 | [Safety-Kleen](https://www.tamtam.ai/c/safety-kleen) (safety-kleen.com)<br>Leading environmental services company offering used oil recycling, parts cleaning, and other responsible solutions to protect customers and the environment | Environmental Services | 🇺🇸 Plano | 3,098 |  |
| 12 | [Motiva Enterprises LLC](https://www.tamtam.ai/c/motiva-enterprises-llc) (motiva.com)<br>A Houston-based company refines, distributes, and markets petroleum products in the Americas with a large manufacturing complex in Texas Owned by Aramco | Oil and Gas | 🇺🇸 Houston | 2,803 | 1998 |
| 13 | [Darling Ingredients](https://www.tamtam.ai/c/darling-ingredients) (darlingii.com)<br>Transforms animal agriculture and food industry by-products into ingredients for nutrition, animal feed, crops, and renewable energy worldwide. | Manufacturing | 🇺🇸 Irving | 2,759 | 1882 |
| 14 | [ALKEGEN](https://www.tamtam.ai/c/alkegen) (alkegen.com)<br>Specialty materials leader for mission-critical systems in battery technologies, electric vehicles, filtration media, and insulation materials to promote sustainability and energy savings | Industrial Machinery Manufacturing | 🇺🇸 Irving | 2,527 |  |
| 15 | [Oldcastle BuildingEnvelope](https://www.tamtam.ai/c/oldcastle-buildingenvelope) (obe.com)<br>Manufacturing, fabricating, and distributing architectural glass products, aluminum framing systems, and glazing supplies for diverse construction projects across North America. | Wholesale Building Materials | 🇺🇸 Dallas | 2,132 |  |
| 16 | [Ascend Performance Materials](https://www.tamtam.ai/c/ascend-performance-materials) (ascendmaterials.com)<br>Global manufacturer specializing in nylon 6,6 materials for diverse applications including apparel, automotive parts, electronics, and industrial products. | Chemical Manufacturing | 🇺🇸 Houston | 2,065 | 2009 |
| 17 | [SI Group](https://www.tamtam.ai/c/si-group) (siigroup.com)<br>Provides performance additives and intermediates for pharmaceuticals, plastics, oil and gas, tires, enhancing efficacy and productivity in manufacturing. | Chemical Manufacturing | 🇺🇸 The Woodlands | 1,988 | 1906 |
| 18 | [Nippon Sanso MATHESON](https://www.tamtam.ai/c/nippon-sanso-matheson) (us.nipponsanso.com)<br>Supplier of industrial and specialty gases, gas handling equipment, purification systems, generators, and support services for labs and semiconductor manufacturers worldwide | Chemical Manufacturing | 🇺🇸 Irving | 1,926 | 1927 |
| 19 | [Indorama Ventures: Indovinya](https://www.tamtam.ai/c/indorama-ventures-indovinya) (indovinya.indoramaventures.com)<br>A global producer of chemical intermediates and surfactants with a focus on sustainable solutions for various industries, part of a leading petrochemical group | Chemical Manufacturing | 🇺🇸 The Woodlands | 1,835 |  |
| 20 | [Nalco Champion, An Ecolab Company](https://www.tamtam.ai/c/nalco-champion-an-ecolab-company) (ecolab.com)<br>Provider of specialized services and solutions for the upstream and downstream sectors, now operating as ChampionX and Nalco Water | Oil and Gas | 🇺🇸 Sugar Land | 1,817 |  |
| 21 | [AZZ Inc](https://www.tamtam.ai/c/azz-inc) (azz.com)<br>A leading provider of galvanizing, metal coating, and coil coating solutions, offering corrosion protection to the steel fabrication and coil markets in North America | Metal Treatments | 🇺🇸 Fort Worth | 1,799 | 1956 |
| 22 | [Select Water Solutions](https://www.tamtam.ai/c/select-water-solutions) (selectwater.com)<br>A leader in water management and chemical technology for oil and gas industry, offering comprehensive solutions for well lifecycle optimization | Oil and Gas | 🇺🇸 Gainesville | 1,780 | 2008 |
| 23 | [Vibrantz Technologies Inc.](https://www.tamtam.ai/c/vibrantz-technologies-inc) (vibrantz.com)<br>A global technology leader specialized in color solutions, functional coatings, and specialty minerals to enhance products across various end markets | Chemical Manufacturing | 🇺🇸 Houston | 1,632 | 2022 |
| 24 | [Newpark](https://www.tamtam.ai/c/newpark) (newpark.com)<br>A global provider of efficient and sustainable solutions in fluids systems and mats for various industries worldwide Partnering to deliver reliable services | Oil and Gas | 🇺🇸 Katy | 1,629 | 1932 |
| 25 | [HALLIBURTON ENERGY SERVICES](https://www.tamtam.ai/c/halliburton-energy-services) (halliburton.com)<br>Global energy industry provider with over a century of experience in maximizing reservoir value through various products and services worldwide | Oil and Gas | 🇺🇸 Houston | 1,626 | 1919 |
| 26 | [TETRA Technologies, Inc.](https://www.tamtam.ai/c/tetra-technologies-inc) (onetetra.com)<br>Global energy services company specializing in bromine-based fluids, calcium chloride solutions, water management, frac flowback, and well testing services with a focus on low carbon energy markets | Oil and Gas | 🇺🇸 Spring | 1,599 | 1981 |
| 27 | [Cemex US](https://www.tamtam.ai/c/cemex-us) (cemexusa.com)<br>Global leader in supplying cement, aggregates, concrete, and urbanization solutions while driving innovation to solve building challenges and promote sustainable living | Wholesale Building Materials | 🇺🇸 Houston | 1,476 |  |
| 28 | [Quanex](https://www.tamtam.ai/c/quanex) (quanex.com)<br>A global manufacturing company focused on innovation, efficiency, community impact, shareholder value, and employee development in various markets worldwide | Wholesale Building Materials | 🇺🇸 Houston | 1,420 | 1927 |
| 29 | [Kraton Corporation](https://www.tamtam.ai/c/kraton-corporation) (kraton.com)<br>Development and production of biobased chemicals and specialty polymers serving over 800 customers globally with sustainable, innovative solutions. | Chemical Manufacturing | 🇺🇸 The Woodlands | 1,399 |  |
| 30 | [Heidelberg Materials North America](https://www.tamtam.ai/c/heidelberg-materials-north-america) (heidelbergmaterials.us)<br>Supplying cement, aggregates, ready mixed concrete, asphalt and other essential building materials for infrastructure and commercial development throughout diverse North American markets. | Wholesale Building Materials | 🇺🇸 Irving | 1,351 | 1897 |
| 31 | [Wilsonart](https://www.tamtam.ai/c/wilsonart) (wilsonart.com)<br>Manufacture and distribute high-performance decorative engineered surfaces including laminates, countertops, adhesives, and wall panels for multiple commercial and residential markets. | Wholesale Building Materials | 🇺🇸 Temple | 1,319 |  |
| 32 | [HollyFrontier](https://www.tamtam.ai/c/hollyfrontier) (hfsinclair.com)<br>Independent petroleum refiner producing gasoline, diesel, jet fuel, asphalt, lubricants, operating refineries and logistics in U.S. regions. | Oil and Gas | 🇺🇸 Dallas | 1,265 |  |
| 33 | [BJ Energy Solutions](https://www.tamtam.ai/c/bj-energy-solutions) (bjenergy.com)<br>An industry leader in hydraulic fracturing solutions for upstream oil and gas companies, focusing on innovation, sustainability, and emission reductions | Oil and Gas | 🇺🇸 The Woodlands | 1,249 | 1872 |
| 34 | [CalTex](https://www.tamtam.ai/c/caltex) (caltexus.com)<br>Leading manufacturer of environmental and appearance protection products for automotive industry, based in San Antonio, Texas Also offers detail products and reinsurance services | Motor Vehicle Manufacturing | 🇺🇸 Schertz | 1,147 | 1983 |
| 35 | [Poly-America, LP](https://www.tamtam.ai/c/poly-america-lp) (poly-america.com)<br>A leading producer of polyethylene products including construction film, trash bags, geomembrane liners, and a top polyethylene recycler and compounder | Plastics Manufacturing | 🇺🇸 Grand Prairie | 1,072 | 1976 |
| 36 | [Matheson Tri-Gas](https://www.tamtam.ai/c/matheson-tri-gas) (mathesongas.com)<br>Supplier of industrial and specialty gases, gas handling equipment, gas purification systems, generators, and management accessories for various industries worldwide | Chemicals | 🇺🇸 Irving | 1,053 |  |
| 37 | [Lummus Technology](https://www.tamtam.ai/c/lummus-technology) (lummustechnology.com)<br>A global leader in developing technology solutions for a sustainable, low carbon future, specializing in process technologies, catalysts, equipment, and digitalization | Business Consulting and Services | 🇺🇸 Houston | 1,027 | 1907 |
| 38 | [CVR Partners, LP](https://www.tamtam.ai/c/cvr-partners-lp) (cvrpartners.com)<br>A growth-oriented company producing nitrogen fertilizer using advanced technologies, serving a growing population with a focus on value, safety, and environmental consciousness | Chemical Manufacturing | 🇺🇸 Sugar Land | 869 |  |
| 39 | [Ecobat](https://www.tamtam.ai/c/ecobat) (ecobat.com)<br>Global leader in battery recycling, providing sustainable solutions for essential energy storage needs in a circular economy Powers industries worldwide Offers job opportunities | Mining | 🇺🇸 Dallas | 863 | 1938 |
| 40 | [Axiall, a Westlake Company](https://www.tamtam.ai/c/axiall-a-westlake-company) (westlake.com)<br>Chemical and building products company acquired by Westlake Corporation, focusing on manufacturing and supplying essential industrial materials. | Chemical Manufacturing | 🇺🇸 Houston | 849 |  |
| 41 | [CVR Energy, Inc.](https://www.tamtam.ai/c/cvr-energy-inc) (cvrenergy.com)<br>Diversified holding company in Sugar Land, Texas, engaged in renewable fuels, petroleum refining, nitrogen fertilizer manufacturing, with strong financial performance and growth | Oil and Gas | 🇺🇸 Sugar Land | 842 | 1906 |
| 42 | [A. Schulman, Inc.](https://www.tamtam.ai/c/a-schulman-inc) (lyondellbasell.com)<br>production of plastics, chemicals, and refining products used in packaging, water pipes, automotive, electronics, and appliance industries worldwide. | Plastics Manufacturing | 🇺🇸 Houston | 840 | 1928 |
| 43 | [U.S. Silica Company](https://www.tamtam.ai/c/u-s-silica-company) (ussilica.com)<br>Global performance materials company specializing in commercial silica for oil and gas and industrial applications, with expertise in mining, processing, and logistics | Mining | 🇺🇸 Katy | 838 | 1900 |
| 44 | [Orion S.A.](https://www.tamtam.ai/c/orion-s-a-spring) (orioncarbons.com)<br>Supplier of carbon black powder and pellets for tires, coatings, batteries, plastics, providing reinforcement, conductivity, durability, and UV protection worldwide. | Chemical Manufacturing | 🇺🇸 Spring | 836 | 2011 |
| 45 | [TPC Group](https://www.tamtam.ai/c/tpc-group) (tpcgrp.com)<br>A Houston-based company specializing in chemical products for major chemical and petroleum companies worldwide, focusing on hydrocarbon processing and specialty chemicals | Chemical Manufacturing | 🇺🇸 Houston | 781 | 1944 |
| 46 | [KMG](https://www.tamtam.ai/c/kmg) (kmgchemicals.com)<br>Manufacture, formulate, and distribute specialty chemicals for electronics, wood preservation, and industrial lubricants markets worldwide with high purity standards. | Chemical Manufacturing | 🇺🇸 Fort Worth | 774 | 1986 |
| 47 | [Kuraray America, Inc.](https://www.tamtam.ai/c/kuraray-america-inc) (kuraray.us.com)<br>pioneers, manufactures, sells resins, chemicals, activated carbon, fibers, textiles, specialty dental materials, other functional products, improving environment, enhancing global life quality of life | Chemical Manufacturing | 🇺🇸 Houston | 757 | 1963 |
| 48 | [CITGO](https://www.tamtam.ai/c/citgo) (citgo.com)<br>A brief description is provided on the LinkedIn profile | Oil and Gas | 🇺🇸 Houston | 749 | 1983 |
| 49 | [UPG](https://www.tamtam.ai/c/upg) (upgintl.com)<br>A US-based manufacturer specializing in OEM, contract manufacturing, and injection molding for data centers, automotive, and general industrial markets worldwide | Plastics Manufacturing | 🇺🇸 Houston | 625 | 1954 |
| 50 | [Genesis Energy, L.P.](https://www.tamtam.ai/c/genesis-energy-l-p) (genesisenergy.com)<br>A diversified midstream energy company offering supply and logistics solutions in offshore pipeline transportation, chemicals, onshore facilities, and marine transportation | Oil and Gas | 🇺🇸 Houston | 618 | 1996 |

## 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 11, 2026.

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Source: https://www.tamtam.ai/l/chemical-companies-texas