MPLX LP owns and operates midstream energy infrastructure and logistics assets primarily in the United States. It operates in two segments, Logistics and Storage, and Gathering and Processing. The company is involved in the gathering, processing, and transportation of natural gas; gathering, transportation, fractionation, storage, and marketing of natural gas liquids; gathering, storage, transportation, and distribution of crude oil and refined products, as well as other hydrocarbon-based products and renewables; and sale of residue gas and condensate. It also engages in the inland marine businesses comprising fleet of boats and barges transportation of light products, heavy oils, crude oil, renewable fuels, chemicals, and feedstocks in the Mid-Continent and Gulf Coast regions, as well as a marine repair facility located on the Ohio River; and distribution of fuel, as well as operates refining logistics, terminals, rail facilities, and storage caverns. In addition, the company operates terminal facilities for the receipt, storage, blending, additization, handling, and redelivery of refined petroleum products through the pipeline, rail, marine, and over-the-road modes of transportation. MPLX GP LLC acts as the general partner of MPLX LP. The company was incorporated in 2012 and is headquartered in Findlay, Ohio. MPLX LP operates as a subsidiary of Marathon Petroleum Corporation.

Plains All American Pipeline, L.P., through its subsidiaries, engages in the pipeline transportation, terminaling, storage, and gathering of crude oil and natural gas liquids (NGL) in the United States and Canada. The company operates through two segments, Crude Oil and NGL. The Crude Oil segment offers gathering and transporting crude oil through pipelines, gathering systems, trucks, and on barges or railcars. This segment provides terminaling, storage, and other facilities-related services, as well as merchant activities. The NGL segment is involved in natural gas processing and NGL fractionation, storage, transportation, and terminaling. This segment also includes ethane, propane, normal butane, iso-butane, and natural gasoline derived from natural gas production and processing activities, as well as crude oil refining processes. Its NGL components are used for various applications, such as heating, engine, and industrial fuels. The company was founded in 1981 and is headquartered in Houston, Texas. Plains All American Pipeline, L.P. operates as a subsidiary of Plains GP Holdings, L.P.

Delek Logistics Partners, LP provides gathering, pipeline, transportation, and other services for crude oil, intermediates, refined products, natural gas, storage, wholesale marketing, terminalling water disposal and recycling customers in the United States. The Gathering and Processing segment consists of pipelines, tanks, and offloading facilities that provide crude oil and natural gas gathering and processing, water disposal and recycling, and storage services, as well as crude oil transportation services to third parties. The Wholesale Marketing and Terminalling segment includes refined products terminals and pipelines in Texas, Tennessee, and Arkansas. This segment provides marketing services for the refined products and terminalling services at refined products terminals to independent third parties. The Storage and Transportation segment comprises tanks, offloading facilities, trucks, and ancillary assets, which provide crude oil, intermediate, and refined products transportation and storage services. Delek Logistics GP, LLC serves as the general partner of the company. Delek Logistics Partners, LP was incorporated in 2012 and is headquartered in Brentwood, Tennessee. Delek Logistics Partners, LP operates as a subsidiary of Delek US Holdings, Inc.

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.

Suburban Propane Partners, L.P., through its subsidiaries, engages in the retail marketing and distribution of propane, renewable propane, fuel oil, and refined fuels in the United States. The company operates through four segments: Propane, Fuel Oil and Refined Fuels, Natural Gas and Electricity, and All Other. The Propane segment is involved in the retail distribution of propane for space heating, water heating, cooking, and clothes drying for use as a motor fuel in internal combustion engines to power over-the-road vehicles, forklifts, and stationary engines, as well as to fire furnaces as a cutting gas to the industrial customers; and for tobacco curing, crop drying, poultry brooding, and weed control in the agricultural markets. It also engages in the wholesale distribution of propane to industrial end users. Its Fuel Oil and Refined Fuels segment engages in the retail distribution of fuel oil, diesel, kerosene, and gasoline to residential and commercial customers for use in primarily as a source of heat in homes and buildings. The Natural Gas and Electricity segment markets natural gas and electricity to residential and commercial customers in the deregulated energy markets in New York and Pennsylvania. The All Other segment sells, installs, and services a range of home comfort equipment, including whole-house heating products, air cleaners, humidifiers, and space heaters. The company serves residential, commercial, industrial, and agricultural customers primarily in the east and west coast regions of the United States, as well as portions of the Midwest region of the United States and Alaska. Suburban Propane Partners, L.P. was founded in 1945 and is based in Whippany, New Jersey.

CrossAmerica Partners LP engages in the wholesale distribution of motor fuels, operation of convenience stores, and ownership and leasing of real estate used in the retail distribution of motor fuels in the United States. It operates in two segments, Wholesale and Retail. The Wholesale segment engages in the wholesale distribution of motor fuels to lessee dealers, independent dealers, commission agents, and company operated retail sites. The Retail segment is involved in the sale of convenience merchandise items; and retail sale of motor fuels at company operated retail sites and retail sites operated by commission agents. CrossAmerica GP LLC operates as the general partner of the company. The company was formerly known as Lehigh Gas Partners LP and changed its name to CrossAmerica Partners LP in October 2014. The company was founded in 1992 and is based in Allentown, Pennsylvania.

NGL Energy Partners LP engages in the transportation, storage, blending, and marketing of crude oil, natural gas liquids, refined products/renewables, and water solutions. The company operates through three segments: Water Solutions, Crude Oil Logistics, and Liquids Logistics. The Water Solutions segment transports, treats, recycles, and disposes produced and flowback water generated from crude oil and natural gas production; aggregates and sells recovered crude oil; disposes solids, such as tank bottoms, and drilling fluid and muds, as well as performs truck and frac tank washouts; and sells produced water for reuse and recycle, and brackish non-potable water. The Crude Oil Logistics segment purchases crude oil from producers and marketers, and transports it to refineries for resale at pipeline injection stations, storage terminals, barge loading facilities, rail facilities, refineries, and other trade hubs; and provides storage, terminaling, and transportation services through pipelines and storage tanks. The Liquids Logistics segment supplies natural gas liquids, refined petroleum products, and biodiesel to commercial, retail, and industrial customers in the United States and Canada through its 23 terminals, third-party storage and terminal facilities, and nine common carrier pipelines, as well as through a fleet of leased railcars. This segment also provides services for marine exports of butane through its facility located in Chesapeake, Virginia; and owns a propane pipeline in Michigan. NGL Energy Holdings LLC serves as the general partner of the company. The company was founded in 1940 and is headquartered in Tulsa, Oklahoma.

Martin Midstream Partners L.P., together with its subsidiaries, provides terminalling, processing, storage, and packaging services for petroleum products and by-products primarily in the United States. The company operates in four segments: Terminalling and Storage, Transportation, Sulfur Services, and Specialty Products. The company's Terminalling and Storage segment owns or operates various marine shore-based terminal facilities and specialty terminal facilities that provide storage, refining, blending, packaging, and handling services for producers and suppliers of petroleum products and by-products. This segment also offers land rental services to oil and gas companies, as well as storage and handling services for lubricants and fuels. Its Transportation segment operates various trucks and tank trailers; and inland marine tank barges, inland push boats, and articulated offshore tug and barge unit to transport petroleum products and by-products, petrochemicals, and chemicals. The company's Sulfur Services segment processes molten sulfur into prilled or pelletized sulfur, which is used in the production of fertilizers and industrial chemicals. Its Specialty Products segment stores, distributes, and transports natural gas liquids for wholesale deliveries to refineries, industrial natural gas liquid users, and propane retailers. Martin Midstream GP LLC serves as a general partner of the company. Martin Midstream Partners L.P. was incorporated in 2002 and is based in Kilgore, Texas.