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.

Western Midstream Partners, LP, together with its subsidiaries, operates as a midstream energy company primarily in the United States. It is involved in gathering, compressing, treating, processing, and transporting natural gas; gathering, stabilizing, and transporting condensate, natural gas liquids (NGLs), and crude oil; and gathering and disposing produced water. The company also buys and sells natural gas, NGLs, and condensate. It operates assets located in Texas, New Mexico, the Rocky Mountains, and North-central Pennsylvania. Western Midstream Holdings, LLC operates as the general partner of the company. The company was formerly known as Western Gas Equity Partners, LP and changed its name to Western Midstream Partners, LP in February 2019. Western Midstream Partners, LP was incorporated in 2007 and is based in The Woodlands, Texas.

Sunoco LP, together with its subsidiaries, distributes and retails motor fuels in the United States. It operates through two segments: Fuel Distribution and Marketing, and All Other. The Fuel Distribution and Marketing segment purchases motor fuel, as well as other petroleum products, such as propane and lubricating oil from independent refiners and oil companies and supplies it to company-operated retail stores, independently operated commission agents, and retail stores, as well as other commercial customers, including unbranded retail stores, other fuel distributors, school districts, municipalities, and other industrial customers. It owns and operates retail stores under the APlus and Aloha Island Mart brand names; and offers food, beverages, snacks, grocery and non-food merchandise, motor fuels, and other services. The All Other segment includes partnership credit card services, franchise royalties, and retail operations; and offers credit card processing, car washes, lottery, automated teller machines, money order, prepaid phone cards, and wireless services. The company was formerly known as Susser Petroleum Partners LP and changed its name to Sunoco LP in 2014. Sunoco LP was founded in 1886 and is headquartered in Dallas, Texas.

UGI Corporation, together with its subsidiaries, distributes, stores, transports, and markets energy products and related services in the United States and internationally. The company operates through four segments: AmeriGas Propane, UGI International, Midstream & Marketing, and UGI Utilities. It distributes propane to approximately 1.3 million residential, commercial/industrial, motor fuel, agricultural, and wholesale customers through 1,400 propane distribution locations. The company distributes liquefied petroleum gases (LPG) to residential, commercial, industrial, agricultural, wholesale and automobile fuel customers; and provides logistics, storage, and other services to third-party LPG distributors. In addition, it engages in the retail sale of natural gas, liquid fuels, and electricity to approximately 12,400 residential, commercial, and industrial customers at 42,000 locations. Further, the company distributes natural gas to approximately 677,000 customers in eastern and central Pennsylvania counties through its distribution system of approximately 12,500 miles of gas mains; and supplies electricity to approximately 62,600 customers in northeastern Pennsylvania through 2,560 miles of lines and 14 substations. Additionally, it operates electric generation facilities, which include coal-fired, landfill gas-fueled, solar-powered, and natural gas-fueled facilities; a natural gas liquefaction, storage, and vaporization facility; propane storage and propane-air mixing stations; and rail transshipment terminals. It manages natural gas pipeline and storage contracts; develops, owns, and operates pipelines, gathering infrastructure, and gas storage facilities. UGI Corporation was incorporated in 1882 and is headquartered in King of Prussia, Pennsylvania.

Plains GP Holdings, L.P., through its subsidiary, Plains All American Pipeline, L.P., owns and operates midstream infrastructure systems in the United States and Canada. It operates in two segments, Crude Oil and Natural Gas Liquids (NGLs). The company engages in the gathering and transporting crude oil and NGLs using pipelines, gathering systems, and trucks. It engages in the loading and unloading services at terminals; NGL fractionation and isomerization services; and natural gas and condensate processing services. The company offers logistics services to producers, refiners, and other customers. PAA GP Holdings LLC operates as a general partner of the company. Plains GP Holdings, L.P. was incorporated in 2013 and is headquartered in Houston, Texas.

Global Partners LP engages in the purchasing, selling, gathering, blending, storing, and logistics of transporting gasoline and gasoline blendstocks, distillates, residual oil, renewable fuels, crude oil, and propane to wholesalers, retailers, and commercial customers. The company operates through three segments: Wholesale, Gasoline Distribution and Station Operations, and Commercial. The Wholesale segment sells home heating oil, branded and unbranded gasoline and gasoline blendstocks, diesel, kerosene, and residual oil to home heating oil and propane retailers and wholesale distributors. This segment also transports the products by railcars, barges, trucks and/or pipelines. Its Gasoline Distribution and Station Operations segment sells branded and unbranded gasoline to gasoline station operators and sub-jobbers; operates gasoline stations and convenience stores; and provides car wash, lottery, and ATM services, as well as leases gasoline stations. The Commercial segment sells and delivers unbranded gasoline, home heating oil, diesel, kerosene, residual oil, and bunker fuel to customers in the public sector, as well as to commercial and industrial end-users; and sells custom blended fuels. The company is also involved in the transportation of petroleum products and renewable fuels through rail from the mid-continent region of the United States and Canada. Global Partners LP was founded in 2005 and is based in Waltham, Massachusetts.

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.

Arko Corp. operates convenience stores in the United States. It operates through Retail, Wholesale, Fleet Fueling, and GPMP segments. The Retail segment engages in the sale of fuel and merchandise to retail consumers. Its Wholesale segment supplies fuel to third-party dealers and consignment agents. The Fleet Fueling segment supplies fuel to proprietary and third-party cardlock, and issuance of proprietary fuel cards. Its GPMP segment supplies fuel to retail and wholesale segments. The company is based in Richmond, Virginia.