# Top 30 chemical companies in Houston

Tamtam tracks 47 chemical companies headquartered in Houston. This list ranks the 30 largest by number of employees on LinkedIn, led by LyondellBasell, Westlake and CITGO. Their median headcount is 757. Half of them were founded in 1986 or later.

These Houston-based companies operate predominantly in chemical manufacturing, oil and gas, and wholesale building materials. The list includes large firms such as LyondellBasell, a global chemical company producing polymers and polyolefins, and Westlake, which manufactures petrochemicals and building products. Other notable companies are CITGO, operating in refining and marketing petroleum products, and HALLIBURTON ENERGY SERVICES, a long-standing provider to the global energy industry.

A significant number of these companies are well-established, with several founded in the mid-20th century, such as TPC Group (1944) and Kuraray America, Inc. (1963). However, there is also a presence of more recently established firms like LyondellBasell (2007) and Vibrantz Technologies Inc. (2022), indicating a mix of mature and newer entities in the Houston industrial landscape.

🇺🇸 Houston · 30 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [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 |
| 2 | [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 |
| 3 | [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 |
| 4 | [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 |
| 5 | [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 |
| 6 | [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 |
| 7 | [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 |
| 8 | [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 |
| 9 | [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 |  |
| 10 | [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 |
| 11 | [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 |
| 12 | [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 |  |
| 13 | [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 |
| 14 | [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 |
| 15 | [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 |
| 16 | [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 |
| 17 | [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 |
| 18 | [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 |
| 19 | [Continental Carbon](https://www.tamtam.ai/c/continental-carbon) (continentalcarbonasia.com)<br>A technology leader in the carbon black industry, utilizing waste streams to produce high-quality carbon black and tail gas for renewable power generation | Chemical Manufacturing | 🇺🇸 Houston | 596 | 1936 |
| 20 | [Rockwater Energy Solutions](https://www.tamtam.ai/c/rockwater-energy-solutions) (selectwater.com)<br>Select Chemistry, formerly Rockwater, offers products and services for the water industry, focusing on unity and connectivity with customers | Oil and Gas | 🇺🇸 Houston | 531 | 2011 |
| 21 | [Vortex Companies - Trenchless Infrastructure Rehabilitation Solutions](https://www.tamtam.ai/c/vortex-companies-trenchless-infrastructure-rehabilitation-solutions) (vortexcompanies.com)<br>The company provides advanced trenchless technologies and turnkey services to effectively renew water, sewer, and industrial infrastructure with experienced personnel | Utilities | 🇺🇸 Houston | 505 | 2015 |
| 22 | [RectorSeal](https://www.tamtam.ai/c/rectorseal) (rectorseal.com)<br>A leading provider of quality solutions for HVAC/R, plumbing, electrical, and construction trades, focusing on customer service and employee satisfaction | Manufacturing | 🇺🇸 Houston | 504 | 1937 |
| 23 | [AES Drilling Fluids](https://www.tamtam.ai/c/aes-drilling-fluids) (aesfluids.com)<br>Specializing in designing and manufacturing drilling fluids tailored to customer needs, ensuring quality and reliability from the well site to the office | Oil and Gas | 🇺🇸 Houston | 500 |  |
| 24 | [Ketjen Corporation](https://www.tamtam.ai/c/ketjen-corporation) (ketjen.com)<br>Provides advanced catalyst solutions to industries like refining, petrochemicals, and specialty chemicals to improve production performance and business value globally | Chemical Manufacturing | 🇺🇸 Houston | 488 | 2023 |
| 25 | [Westlake Pipe & Fittings](https://www.tamtam.ai/c/westlake-pipe-and-fittings) (westlakepipe.com)<br>A leading PVC pipe manufacturer in North America, producing gasketed, solvent welded, and restrained joint pipes for various markets with superior customer service | Plastics Manufacturing | 🇺🇸 Houston | 482 | 1992 |
| 26 | [Ecoservices](https://www.tamtam.ai/c/ecoservices) (ecovyst.com)<br>A leading provider in sulfuric acid regeneration and supply, offering liquid aluminum sulfate, industrial waste treatment, and tank cleaning services with a focus on reliability and safety | Chemical Manufacturing | 🇺🇸 Houston | 346 |  |
| 27 | [CARBO](https://www.tamtam.ai/c/carbo) (carbo.tech)<br>A leading technology and service company offering innovative solutions in various industries with a focus on value and performance | Manufacturing | 🇺🇸 Houston | 331 | 1979 |
| 28 | [UTEX Industries Inc.](https://www.tamtam.ai/c/utex-industries-inc) (utexind.com)<br>Leader in designing and manufacturing custom high-performance sealing solutions for Oil & Gas, water distribution, aerospace, and industrial markets worldwide | Oil and Gas | 🇺🇸 Houston | 329 | 1940 |
| 29 | [Aegis Chemical Solutions](https://www.tamtam.ai/c/aegis-chemical-solutions) (aegischemical.com)<br>Aegis Chemical Solutions provides high-quality chemical treatments and technical services for oilfield applications, including production chemicals, completion chemicals, and water treatment solutions | Oil and Gas | 🇺🇸 Houston | 240 | 2012 |
| 30 | [EverZinc](https://www.tamtam.ai/c/everzinc) (everzinc.com)<br>Global provider of specialty zinc materials for various industries, with manufacturing operations worldwide and a focus on innovation and customer service | Chemical Manufacturing | 🇺🇸 Houston | 232 | 2016 |

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