Marathon Petroleum Corporation, together with its subsidiaries, operates as an integrated downstream energy company primarily in the United States. The company operates through Refining & Marketing, and Midstream segments. The Refining & Marketing segment refines crude oil and other feedstocks at its refineries in the Gulf Coast, Mid-Continent, and West Coast regions of the United States; and purchases refined products and ethanol for resale and distributes refined products, including renewable diesel, through transportation, storage, distribution, and marketing services. Its refined products include transportation fuels, such as reformulated gasolines and blend-grade gasolines; heavy fuel oil; and asphalt. This segment also manufactures propane and petrochemicals. It sells refined products to wholesale marketing customers in the United States and internationally, buyers on the spot market, and independent entrepreneurs who operate primarily Marathon branded outlets, as well as through long-term fuel supply contracts to direct dealer locations primarily under the ARCO brand. The Midstream segment transports, stores, distributes, and markets crude oil and refined products through refining logistics assets, pipelines, terminals, towboats, and barges; gathers, processes, and transports natural gas; and gathers, transports, fractionates, stores, and markets natural gas liquids. Marathon Petroleum Corporation was founded in 1887 and is headquartered in Findlay, Ohio.

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.

Valero Energy Corporation manufactures, markets, and sells petroleum-based and low-carbon liquid transportation fuels and petrochemical products in the United States, Canada, the United Kingdom, Ireland, Latin America, Mexico, Peru, and internationally. It operates through three segments: Refining, Renewable Diesel, and Ethanol. The company produces California Reformulated Gasoline Blendstock for Oxygenate Blending and Conventional Blendstock for Oxygenate Blending gasolines, CARB diesel, diesel, jet fuel, heating oil, and asphalt; feedstocks; aromatics; sulfur and residual fuel oil; intermediate oils; and sulfur, sweet, and sour crude oils. It sells its refined products through wholesale rack and bulk markets; and through outlets under the Valero, Beacon, Diamond Shamrock, Shamrock, Ultramar, and Texaco brands. The company owns and operates renewable diesel and ethanol plants, as well as produces renewable diesel and naphtha under the Diamond Green Diesel brand name. In addition, it offers ethanol and various co-products, including dry distiller grains, syrup, and inedible distillers corn oil to animal feed customers. The company was formerly known as Valero Refining and Marketing Company and changed its name to Valero Energy Corporation in August 1997. Valero Energy Corporation was founded in 1980 and is headquartered in San Antonio, 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.

PBF Energy Inc., through its subsidiaries, engages in refining and supplying petroleum products. The company operates in two segments, Refining and Logistics. It produces gasoline, ultra-low-sulfur diesel, heating oil, diesel fuel, jet fuel, lubricants, petrochemicals, and asphalt, as well as unbranded transportation fuels, petrochemical feedstocks, blending components, and other petroleum products from crude oil. The company sells its products in Northeast, Midwest, Gulf Coast, and West Coast of the United States, as well as in other regions of the United States, Canada, Mexico, and internationally. It is also involved in the provision of various rail, truck, and marine terminaling services, as well as pipeline transportation and storage services. The company was founded in 2008 and is based in Parsippany, New Jersey.

Stepan Company, together with its subsidiaries, produces and sells specialty and intermediate chemicals to other manufacturers for use in various end products worldwide. It operates through three segments: Surfactants, Polymers, and Specialty Products. The Surfactants segment offers surfactants that are used in consumer and industrial cleaning and disinfection products, including detergents for washing clothes, dishes, carpets, and floors and walls, as well as shampoos and body washes; and other applications, such as fabric softeners, germicidal quaternary compounds, disinfectants, and lubricating ingredients. Its surfactants are also used in various applications, including emulsifiers for spreading agricultural products; and industrial applications comprising latex systems, plastics, and composites. The Polymers segment provides polyurethane polyols that are used in the manufacture of rigid foam for thermal insulation in the construction industry, as well as a base raw material for coatings, adhesives, sealants, and elastomers (CASE); polyester resins, including liquid and powdered products, which are used in CASE applications; and phthalic anhydride that is used in unsaturated polyester resins, alkyd resins, and plasticizers for applications in construction materials, as well as components of automotive, boating, and other consumer products. The Specialty Products segment offers flavors, emulsifiers, and solubilizers for use in food, flavoring, nutritional supplement, and pharmaceutical applications. Stepan Company was founded in 1932 and is headquartered in Northbrook, Illinois.

Calumet, Inc. manufactures, formulates, and markets a diversified slate of specialty branded products and renewable fuels to various consumer-facing and industrial markets in North America and internationally. It operates through Specialty Products and Solutions; Montana/Renewables; and Performance brands segments. The Specialty Products and Solutions segment offers various solvents, waxes, customized lubricating oils, white oils, petrolatums, gels, esters, and other products. The Montana/Renewables segment focuses on processing renewable feedstocks into renewable diesel, sustainable aviation fuel, renewable hydrogen, renewable natural gas, renewable propane, and renewable naphtha. It also processes Canadian crude oil into conventional gasoline, diesel, jet fuel, and specialty grades of asphalt. The Performance Brands segment blends, packages, and markets high performance products through Royal Purple, Bel-Ray, and TruFuel brands. The company serves wholesale distributors and retail chains. Calumet, Inc. was founded in 1919 and is headquartered in Indianapolis, Indiana.

Flotek Industries, Inc. operates as a technology-driven green chemistry and data company that serves customers across industrial and commercial markets in the United States, the United Arab Emirates, and internationally. It operates through two segments: Chemistry Technologies (CT) and Data Analytics (DA). The CT segment designs, develops, manufactures, packages, distributes, delivers, and markets green specialty chemicals that enhance the profitability of hydrocarbon producers, as well as green specialty chemistries, and logistics and technology services. This segment primarily serves integrated oil and gas, oilfield services, independent oil and gas, national and state-owned oil, geothermal energy, solar energy, and alternative energy companies. The DA segment designs, develops, produces, sells, and supports equipment and services that create and provide valuable information on the composition and properties of energy customers' hydrocarbon fluids. It sells its products directly through a mix of in-house sales professionals, as well as contractual agency agreements. Flotek Industries, Inc. was incorporated in 1985 and is headquartered in Houston, Texas.