Exxon Mobil Corporation engages in the exploration and production of crude oil and natural gas in the United States and internationally. It operates through Upstream, Energy Products, Chemical Products, and Specialty Products segments. The Upstream segment explores for and produces crude oil and natural gas. The Energy Products segment offers fuels, aromatics, and catalysts, as well as licensing services. It sells its products under the Exxon, Esso, and Mobil brands. The Chemical Products segment manufactures and markets petrochemicals including olefins, polyolefins, and intermediates. The Specialty Products segment offers performance products, including lubricants, basestocks, waxes, synthetics, elastomers, and resins. The company also involves in the manufacturing, trade, transport, and sale of crude oil, natural gas, petroleum products, petrochemicals, and other specialty products; and pursuit lower-emission business opportunities, including carbon capture and storage, hydrogen, lower-emission fuels, and lithium. Exxon Mobil Corporation was founded in 1870 and is based in Spring, Texas.

Shell plc operates as an energy and petrochemical company Europe, Asia, Oceania, Africa, the United States, and Rest of the Americas. The company operates through Integrated Gas, Upstream, Marketing, Chemicals and Products, and Renewables and Energy Solutions segments. It explores for and extracts crude oil, natural gas, and natural gas liquids; markets and transports oil and gas; produces gas-to-liquids fuels and other products; and operates upstream and midstream infrastructure to deliver gas to market. The company also markets and trades natural gas, liquefied natural gas (LNG), crude oil, electricity, carbon-emission rights; and markets and sells LNG as a fuel for heavy-duty vehicles. In addition, it trades in and refines crude oil and other feed stocks, such as low-carbon fuels, lubricants, bitumen, sulphur, gasoline, diesel, aviation fuel, and marine fuel; produces and sells petrochemicals for industrial use; and manages oil sands activities. Further, the company produces base chemicals comprising ethylene, propylene, and aromatics, as well as intermediate chemicals, such as styrene monomer, propylene oxide, solvents, detergent alcohols, ethylene oxide, and ethylene glycol. Additionally, it generates electricity through wind and solar resources; produces and sells hydrogen; and provides electric vehicle charging services. The company was formerly known as Royal Dutch Shell plc and changed its name to Shell plc in January 2022. Shell plc was founded in 1907 and is headquartered in London, the United Kingdom.

Phillips 66 operates as an energy manufacturing and logistics company in the United States, the United Kingdom, Germany, and internationally. It operates through four segments: Midstream, Chemicals, Refining, and Marketing and Specialties (M&S). The Midstream segment transports crude oil and other feedstocks; delivers refined petroleum products to market; provides terminaling and storage services for crude oil and refined petroleum products; transports, stores, fractionates, exports, and markets natural gas liquids; provides other fee-based processing services; and gathers, processes, transports, and markets natural gas. The Chemicals segment produces and markets ethylene and other olefin products; aromatics and styrenics products, such as benzene, cyclohexane, styrene, and polystyrene; and various specialty chemical products, including organosulfur chemicals, solvents, catalysts, and chemicals used in drilling and mining. The Refining segment refines crude oil and other feedstocks into petroleum products, such as gasolines, distillates, aviation, and renewable. The M&S segment purchases for resale and markets refined petroleum products, including gasolines, distillates, and aviation fuels. This segment also manufactures and markets specialty products, such as base oils and lubricants. Phillips 66 was founded in 1875 and is headquartered in Houston, Texas.

Occidental Petroleum Corporation, together with its subsidiaries, engages in the acquisition, exploration, and development of oil and gas properties in the United States, the Middle East, and North Africa. It operates through three segments: Oil and Gas, Chemical, and Midstream and Marketing. The company's Oil and Gas segment explores for, develops, and produces oil and condensate, natural gas liquids (NGLs), and natural gas. Its Chemical segment manufactures and markets basic chemicals, including chlorine, caustic soda, chlorinated organics, potassium chemicals, ethylene dichloride, chlorinated isocyanurates, sodium silicates, and calcium chloride; and vinyls comprising vinyl chloride monomer, polyvinyl chloride, and ethylene. The Midstream and Marketing segment gathers, processes, transports, stores, purchases, and markets oil, condensate, NGLs, natural gas, carbon dioxide, and power. This segment also invests in entities. Occidental Petroleum Corporation was founded in 1920 and is headquartered in Houston, Texas.

Celanese Corporation, a chemical and specialty materials company, manufactures and sells high performance engineered polymers in the United States and internationally. It operates through Engineered Materials and Acetyl Chain. The Engineered Materials segment develops, produces, and supplies specialty polymers for automotive and medical applications, as well as for use in industrial products and consumer electronics. The Acetyl Chain segment produces and supplies acetyl products, including acetic acid, vinyl acetate monomers, acetic anhydride, and acetate esters that are used as starting materials for colorants, paints, adhesives, coatings, and pharmaceuticals; and organic solvents and intermediates for pharmaceutical, agricultural, and chemical products. It also offers vinyl acetate-based emulsions for use in paints and coatings, adhesives, construction, glass fiber, textiles, and paper applications; and ethylene vinyl acetate resins and compounds, as well as low-density polyethylene for use in flexible packaging films, lamination film products, hot melt adhesives, automotive parts, and carpeting applications. In addition, it provides redispersible powders (RDP) for use in construction applications, including flooring, plasters, insulation, tiling, and waterproofing. Celanese Corporation was founded in 1918 and is headquartered in Irving, Texas.

Huntsman Corporation manufactures and sells diversified organic chemical products worldwide. The company operates in three segments: Polyurethanes, Performance Products, and Advanced Materials. The Polyurethanes segment offers polyurethane chemicals, including methyl diphenyl diisocyanate, polyether and polyester polyols, and thermoplastic polyurethane; and aniline, benzene, nitrobenzene and other co-products. The Performance Products segment manufactures amines, such as polyetheramines, ethyleneamines, DGA Agent, JEFFCAT catalysts, and E-GRADE specialty amines and carbonates; and maleic anhydrides. The Advanced Materials segment offers epoxy, phenoxy, acrylic, polyurethane, and acrylonitrile-butadiene-based polymer formulations; and thermoset resins, curing and toughening agents, and carbon nanomaterials. The company provides pre-and post-sales technical service support to customers. Its products are used in a range of applications, including adhesives, aerospace, automotive, construction products, durable and non-durable consumer products, electronics, insulation, packaging, coatings and construction, power generation, and refining, as well as serves the elastomers, insulation, footwear, furniture, industrial, oil and gas, liquid natural gas transport, printed circuit boards, consumer, appliances, electrical power transmission and distribution, recreational sports equipment, and medical appliances markets. The company sells its products through a network of distributors and agents. Huntsman Corporation was founded in 1970 and is headquartered in The Woodlands, Texas.

Innospec Inc. develops, manufactures, blends, markets, and supplies specialty chemicals in the United States, rest of North America, the United Kingdom, rest of Europe, and internationally. The company's Fuel Specialties segment offers a range of specialty chemical products that are used as additives in additives in diesel, jet, marine, fuel oil and other fuels. This segment's products are used in the operation of commercial trucking, marine and aviation engines, power station generators, heating oil, and other industrial machinery applications. Its Performance Chemicals segment provides technology-based solutions for its customers' processes or products that focuses on the personal care, home care, agrochemical, construction, mining, and other industrial markets. The company's Oilfield Services segment develops and markets chemical solutions for drilling, completion, fracturing, stimulation, and completion operations; and products for oil and gas production. It sells its products primarily to oil and gas exploration and production companies, oil refineries, fuel manufacturers and users, personal care and home care companies, formulators of agrochemical, and other chemical and industrial companies. The company was formerly known as Octel Corp. and changed its name to Innospec Inc. in January 2006. Innospec Inc. was founded in 1938 and is headquartered in Englewood, Colorado.

AdvanSix Inc. engages in the manufacture and sale of polymer resins in the United States and internationally. It offers Nylon 6, a polymer resin, which is a synthetic material used to produce fibers, filaments, engineered plastics, and films. The company also provides caprolactam to manufacture polymer resins; ammonium sulfate fertilizers to distributors, farm cooperatives, and retailers; and acetone that are used in the production of adhesives, paints, coatings, solvents, herbicides, and engineered plastic resins, as well as other intermediate chemicals, including phenol, monoisopropylamine, dipropylamine, monoallylamine, alpha-methylstyrene, cyclohexanone, methyl ethyl ketoxime, acetaldehyde oxime, 2-pentanone oxime, cyclohexanol, sulfuric acid, ammonia, and carbon dioxide. It offers its products under the Aegis, Capran, Sulf-N, Nadone, Naxol, and EZ-Blox brands. The company sells its products directly, as well as through distributors. AdvanSix Inc. was incorporated in 2016 and is headquartered in Parsippany, New Jersey.