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Saudi Aramco is the national oil company of Saudi Arabia and holds the exclusive right to explore for, produce, and refine the country’s hydrocarbons. It is the largest oil and gas producer in the world with a production volume of 12.4 mmboe/d in 2024, including 10.8 mmboe/d of liquids. Its 4.1 mmb/d in net refining capacity makes it the world’s fourth-largest refiner. It also owns 57.6 million metric tons of chemical manufacturing capacity, placing it among the top five global chemical companies.

ExxonMobil is an integrated oil and gas company that explores for, produces, and refines oil worldwide. In 2025, it produced 3.3 million barrels of liquids and 8.4 billion cubic feet of natural gas per day. At the end of 2024, reserves were 19.9 billion barrels of oil equivalent, 69% of which were liquids. The company is one of the world's largest refiners, with a total global refining capacity of 4.3 million barrels of oil per day, and is one of the world's largest manufacturers of commodity and specialty chemicals.

Chevron is an integrated energy company with exploration, production, and refining operations worldwide. It is the second-largest oil company in the United States with production of 3.0 million of barrels of oil equivalent a day, including 7.7 million cubic feet a day of natural gas and 1.7 million of barrels of liquids a day. Production activities take place in North America, South America, Europe, Africa, Asia, and Australia. Its refineries are in the US and Asia for total refining capacity of 1.8 million barrels of oil a day. Proven reserves at year-end 2024 stood at 9.8 billion barrels of oil equivalent, including 5.1 billion barrels of liquids and 28.4 trillion cubic feet of natural gas.

PetroChina, the national champion that inherited the majority of Chinese onshore oil and gas assets, has developed into an international supermajor. In 2024, it produced more than 1.7 billion barrels of oil equivalent of oil and gas, and processed 1.4 billion barrels of crude oil. It also has more than 22,000 service stations. The fluctuations in the prices of crude oil, refined products, chemical products, and natural gas have a significant impact on PetroChina’s revenue. State-owned China National Petroleum Corp is PetroChina’s controlling shareholder with a stake of more than 82%.

GE Vernova is a global leader in the electric power industry, with products and services that generate, transfer, convert, and store electricity. The company has three business segments: power, wind, and electrification. Power includes gas, nuclear, hydroelectric, and steam technologies, providing dispatchable power. The wind segment includes wind generation technologies, inclusive of onshore and offshore wind turbines and blades. Electrification includes grid solutions, power conversion, electrification software, and solar and storage solutions technologies required for the transmission, distribution, conversion, and storage of electricity from the point of generation to point of consumption.

Shell is an integrated oil and gas company that explores for, produces, and refines oil around the world. In 2024, it produced 1.5 million barrels of liquids and 7.7 billion cubic feet of natural gas per day. At year-end 2024, reserves stood at 9.6 billion barrels of oil equivalent, 48% of which consisted of liquids. Its production and reserves are in Europe, Asia, Oceania, Africa, and North and South America. The company operates refineries with a capacity of 1.6 mmb/d located in the Americas, Asia, and Europe, and sells about 12 million tons per year of chemicals. Its largest chemical plants, often integrated with its local refineries, are in Central Europe, China, Singapore, and North America.

TotalEnergies is an integrated oil and gas company that explores for, produces, and refines oil around the world. In 2024, it produced 1.5 million barrels of liquids and 5.2 billion cubic feet of natural gas per day. At the end of 2024, reserves stood at 11.1 billion barrels of oil equivalent, 54% of which are liquids. During 2024, it had LNG sales of 39.8 million metric tons. The company owns interests in refineries with a capacity of nearly 1.8 million barrels a day, primarily in Europe, distributes refined products in 65 countries, and manufactures commodity and specialty chemicals. At year-end, its gross installed renewable power generation capacity was 26 gigawatts.

Reliance Industries Ltd is engaged in hydrocarbon exploration and production, refining and marketing, petrochemicals, financial services, retail, and communications. The Group has five principal operating and reporting segments: Oil to Chemicals (O2C), Oil and Gas, Retail, Digital Services, and other services. Reliance's refineries produce a range of petroleum products that find use as fuel variants, feedstock, and fuel for power and cement plants. Fuels produced in refineries are exported to several countries and can be processed into any grade of gasoline or diesel. The Oil to Chemicals segment, which derives the majority of revenue, includes Refining, Petrochemicals, fuel retailing through Reliance BP Mobility Limited, aviation fuel, and bulk wholesale marketing.

CNOOC is China's main offshore oil and gas exploration and production company. Through its parent company, it has exclusive rights to partner with foreign companies in offshore China projects. Net production for 2024 reached 726.8 million barrels of oil equivalent (78.0% oil), and year-end proven reserves were 7.27 billion barrels of oil equivalent. Assets outside China make up around 32.2% of production.

Siemens Energy manufactures a wide range of equipment used to generate and transmit energy. The group is a product of the spinout from Siemens AG in 2020, consisting of the power and gas segment and Siemens Gamesa, although its operations go back over 150 years. Approximately one-sixth of global electricity generation is based on its technology.

ConocoPhillips is a US-based independent exploration and production firm. Its operations are primarily in Alaska and the Lower 48, with footprints in Canada, Europe, Asia-Pacific, the Middle East, and Africa. It also has substantial integrated LNG production and marketing activities across geographies.

China Shenhua Energy Co Ltd is a globally integrated coal-based energy company, mainly engaging in business segments: Coal, Power generation, Shipping, railway, port, and Coal chemical. Focusing on its core coal mining operation, China Shenhua leverages its self-developed transportation and sales network as well as downstream power plants, coal-to-chemicals facilities, and new energy projects to achieve cross-sector and cross-industry integrated development and operation.

Petrobras is a Brazil-based integrated energy company controlled by the Brazilian government. The company focuses on exploration and production of oil and gas in Brazilian offshore fields. Production in 2024 was 2.7 million barrels of oil equivalent a day (80% oil production), and reserves stood at 11.4 billion boe (85% oil). At end-2024, Petrobras operated 10 refineries in Brazil with capacity of 1.8 million barrels a day and distributes refined products and natural gas throughout Brazil.

BP is an integrated oil and gas company that explores for, produces, and refines oil around the world. In 2024, it produced 1.2 million barrels of liquids and 6.9 billion cubic feet of natural gas per day. At the end of 2024, reserves stood at 6.2 billion barrels of oil equivalent, 59% of which are liquids. The company operates refineries with a capacity of 1.6 million barrels of oil per day.

Enbridge owns extensive midstream assets that transport hydrocarbons across the US and Canada. Its pipeline network consists of the Canadian Mainline system, regional oil sands pipelines, and natural gas pipelines. The company also operates regulated natural gas utilities in the US and Canada, including Canada's largest natural gas distribution company. The firm has a small renewable energy portfolio primarily focused on onshore and offshore wind projects.

Quanta Services is a leading provider of specialty contracting services, delivering comprehensive infrastructure solutions for the electric and gas utility, communications, pipeline, and energy industries in the United States, Canada, and Australia. Quanta reports its results under two segments: electric and underground utility and infrastructure.

Equinor is a Norway-based integrated oil and gas company. It has been publicly listed since 2001, but the government retains a 67% stake. Operating primarily on the Norwegian Continental Shelf, the firm produced 2.1 million barrels of oil equivalent per day in 2024 (52% liquids) and ended 2024 with 6.1 billion barrels of proven reserves (42% liquids). Operations also include offshore wind, solar, oil refineries and natural gas processing, marketing, and trading.

Canadian Natural Resources is the largest producer of oil and the second-largest producer of natural gas in Canada. It is principally involved in extracting heavy oils, natural gas, and bitumen through its drilling and mining operations. Bitumen from mining operations is upgraded into synthetic crude oil. Commodities produced are primarily exported to the US via pipeline. The company also has smaller offshore production operations in the North Sea and Africa.

Williams operates the Transco pipeline, which connects the Gulf Coast to the Northeast United States. It has additional natural gas transmission pipelines connecting the Rockies to the Pacific Northwest and midcontinent. At the field level, it operates substantial gathering and processing assets in Appalachia and other basins. The company has also struck several power supply agreements.

China Petroleum & Chemical, or Sinopec, is one of China's national oil companies and one of Asian's largest integrated oil companies in revenue. Its income is derived primarily from refining and marketing of oil products and petrochemical production. Sinopec has China's largest petrol station network with over 30,000 stations and enjoys a significant market share in petrochemicals. Established in 2000 by China Petrochemical Corporation, a state-owned enterprise and majority shareholder, the company also owns oil and gas assets in Shandong and Sichuan provinces. It has a smaller global upstream presence than its peers, PetroChina and CNOOC. In 2024, Sinopec’s production of oil and gas equivalent was 515.35 million barrels. The firm also processed 252.30 million metric tons of crude oil.

SLB is the world’s premier oilfield-services company as measured by market share. While the industry is largely fragmented, SLB holds the first or second competitive position in many of the differentiated oligopolies in which it operates. Also known as Schlumberger, the company was founded in 1926 by two brothers bearing the same last name. Today, it’s most known as a global industry leader in innovation, while it focuses its strategy on its three growth engines: core, digital, and new energy businesses. Over three-fourths of its revenue base is tied to international markets, while the company boasts nearly $3 billion in digital-related revenue.

Eni is an integrated oil and gas company that explores for, produces, and refines oil around the world. In 2024, the company produced 0.8 million barrels of liquids and 4.8 billion cubic feet of natural gas per day. At end-2024, Eni held reserves of 6.5 billion barrels of oil equivalent, 46% of which are liquids. The Italian government owns a 30.5% stake in the company. Eni is placing its renewable and low-carbon business in a separate entity called Plenitude, which it will likely list publicly at some point.

Enterprise Products Partners is a master limited partnership that transports and processes natural gas, natural gas liquids, crude oil, refined products, and petrochemicals. It is one of the largest midstream companies, with operations servicing most producing regions in the continental US. Enterprise is particularly dominant in the NGL market and is one of the few MLPs that provide midstream services across the full hydrocarbon value chain.

Suncor Energy Inc is an integrated energy company. The company's operations include oil sands development, production and upgrading, offshore oil production, petroleum refining in Canada and the U.S., and the company's Petro-Canada retail and wholesale distribution networks. The company is developing petroleum resources while advancing the transition to a low-emissions future through investment in power, and renewable fuels. It also conducts energy trading activities focused principally on the marketing and trading of crude oil, natural gas, byproducts, refined products and power. The company's operating segments include Oil Sands, Exploration & Production, Refining & Marketing (R&M), and Corporate & eliminations. Geographically, the company generates a majority of its revenue from Canada.

EOG Resources is an oil and gas producer with acreage in several US shale plays, primarily in the Permian Basin and the Eagle Ford. At the end of 2024, it reported net proven reserves of 4.7 billion barrels of oil equivalent. Net production averaged roughly 1,062 thousand barrels of oil equivalent per day in 2024 at a ratio of 69% oil and natural gas liquids and 31% natural gas.

Valero Energy is one of the largest independent refiners in the United States. It operates 15 refineries, with a total throughput capacity of 3.2 million barrels a day in the US, Canada, and the United Kingdom. Valero also owns 12 ethanol plants with capacity of 1.6 billion gallons a year and holds a 50% stake in Diamond Green Diesel, which can produce 1.2 billion gallons per year of renewable diesel.

Marathon Petroleum is an independent refiner with 13 refineries in the mid continent, West Coast, and Gulf Coast of the United States with total throughput capacity of 3.0 million barrels per day. Its Dickinson, North Dakota, facility produces 184 million gallons a year of renewable diesel. Its Martinez, California, facility has the ability to produce 730 million gallons a year of renewable diesel. The firm also owns and operates midstream assets primarily through its listed master limited partnership, MPLX.

Kinder Morgan operates natural gas, crude oil, and refined products pipelines connecting producing regions to demand centers. It is principally involved in the gathering, storage, and transmission of natural gas across the continental United States. It also operates distribution centers for refined products along with the largest fleet of Jones Act-compliant tankers.

Phillips 66 is an independent refiner that owns or holds interest in 10 refineries with a total crude throughput capacity of 1.9 million barrels per day, or mmb/d, at the end of 2025. The midstream segment comprises extensive transportation and NGL processing assets. It includes 70,000 miles of crude oil, refined petroleum product, NGL and natural gas pipeline systems, and a comprehensive set of refined petroleum product, NGL and crude oil terminals, gathering and processing plants and fractionation facilities and various other storage and loading facilities. Its CPChem chemical joint venture operates facilities primarily in the United States and the Middle East and produces olefins and polyolefins.

ADNOC Gas PLC is an integrated gas processing company. The Company is responsible for producing, processing, distributing, and marketing natural gas and its derivatives in the UAE and abroad. The company Gas operates a network of pipelines, processing plants, storage facilities, and export terminals that supply gas to various sectors, including power generation, water desalination, petrochemicals, industries, and households. The Company also exports liquefied natural gas (LNG) and liquefied petroleum gas (LPG) to regional and international markets.

TC Energy operates natural gas transmission assets across North America. Segments are determined by country of operation, but both Canadian and US operations are interconnected. Mexican operations are disconnected from the US and only have one customer, the state utility CFE. They also operate power generation assets, with the largest being the Bruce Power nuclear plant.

Energy Transfer is a diversified midstream firm, operating from wellhead to consuming demand. It handles natural gas, natural gas liquids, or NGLs, crude oil, and refined products. Commodities are moved through its network of field level gathering and processing to refineries and demand centers. Operations are concentrated in Texas and the Midcontinent United States. It also controls Sunoco and USA Compression through its general partner relationship.

Following a 2022 reorganization, Baker Hughes operates in two segments: oilfield services and equipment, and industrial and energy technology. The firm's oilfield services and equipment segment is one of the Big Three oilfield-services players, along with SLB and Halliburton, and mostly supplies to hydrocarbon developers and producers, including national oil companies, major integrated firms, and independents. Markets outside of North America buy roughly three-fourths of the segment's offerings. Baker Hughes' industrial and energy technology segment manufactures and sells turbines, compressors, pumps, valves, and related testing and monitoring services for various energy and industrial applications.

Imperial Oil Ltd is an integrated oil company active in all phases of the petroleum industry in Canada, including the exploration for, and production and sale of, crude oil, natural gas, petroleum products, and petrochemicals. It also pursues lower-emission business opportunities, including carbon capture and storage, hydrogen, lower-emission fuels, and lithium. The company's reportable segments are Upstream, Downstream, and Chemical. Maximum revenue for the company is generated from its Downstream segment, which refines crude oil into petroleum products and distributes and market these products. The Upstream segment explores and produces crude oil, its equivalents, and natural gas, and the Chemical segment manufactures and markets hydrocarbon-based chemicals and chemical products.

Sempra Energy serves one of the largest utility customer bases in the United States. It distributes natural gas and electricity in Southern California and owns 80% of Oncor, a transmission and distribution business in Texas. Sempra Infrastructure partners, of which Sempra will hold a 25% ownership, owns and operates liquefied natural gas facilities in North America and infrastructure in Mexico.

Diamondback is a crude oil and natural gas exploration and production firm whose operations represent a pure-play in the US Permian Basin. The company went public in 2012 and has established itself as a top-tier independent producer through disciplined acquisition and operational excellence. The company's most transformational transaction occurred in September 2024 with the completion of its $26 billion merger with Endeavor Energy Resources, which added around 470,000 net acres and doubled Diamondback's total acreage position. Diamondback boasts an enviable position in the Midland sub-basin, with some of the lowest unit costs among its Permian peers.

Occidental Petroleum is an independent exploration and production company with operations in the United States, Latin America, and the Middle East. At the end of 2024, the company reported net proved reserves of 4.6 billion barrels of oil equivalent. Net production averaged 1.326 million barrels of oil equivalent per day in 2024 at a ratio of roughly 52% oil and natural gas liquids and 48% natural gas.

Since completing the transformative deal with RWE in 2019, E.On has two core businesses: energy networks and customer solutions. Its retail supply serves around 47 million customers primarily in Germany, the United Kingdom, Eastern Europe, the Netherlands, Belgium, and Sweden. Its networks business operates in Germany, Sweden, Eastern Europe, and Turkey.

MPLX is a partnership that owns pipelines and gathering and processing assets with extensive holdings in the Appalachian and Permian regions. The asset base is made up of crude oil and refined products assets dropped down from Marathon Petroleum, its sponsor, and natural gas and natural gas liquids gathering and processing assets that were purchased or built.

Cheniere Energy is a liquified natural gas, or LNG, producer with two facilities in Corpus Christi, Texas and Sabine Pass, Louisiana. It generates most of its revenue through long-term contracts with customers on a fixed and variable fee payout structure. It also generates revenue by selling uncontracted LNG to customers on a short or one-time basis. A subsidiary, Cheniere Energy Partners, owns the Sabine Pass facility and trades as a master limited partnership.

Cenovus Energy Inc is a Canadian integrated energy group. The group's upstream operations include oil sands projects in northern Alberta; thermal and conventional crude oil, natural gas, and natural gas liquids (NGLs) projects across Western Canada; crude oil production offshore Newfoundland and Labrador; and natural gas and NGLs production offshore China and Indonesia. Its downstream operations include upgrading and refining operations in Canada and the U.S., and commercial fuel operations across Canada. The group's reportable segments are: Oil Sands, Conventional, Offshore, Canadian Refining, U.S Refining, and Corporate and Eliminations. Maximum revenue is generated from its Oil Sands segment. Geographically, the group derives maximum revenue from the U.S., followed by Canada and China.

Targa Resources Corp is a midstream firm that mainly operates gathering and processing assets with substantial positions in the Permian, Stack, Scoop, and Bakken plays. It has fractionation capacity at Mont Belvieu and operates a liquefied petroleum gas export terminal. The Grand Prix natural gas liquids pipeline is another important asset. It has two operating segments: Gathering and Processing, and, Logistics and Transportation (also referred to as the Downstream Business).

Since the deal with E.On, RWE is refocused on power generation, mostly in Europe. It owns 38 gigawatts of power generation capacity: 17% from lignite and hard coal plants, 36% from gas plants, 40% from renewables including pumped storage and batteries. Besides Germany, RWE’s power plants are chiefly located in the United Kingdom, the Netherlands, Turkey, and the United States for many onshore wind farms.

Incorporated in 1954 and named after the small Victorian town of Woodside, Woodside's early exploration focus moved from Victoria's Gippsland Basin to Western Australia's Carnarvon Basin. First LNG production from the North West Shelf came in 1984. BHP Billiton and Shell each had 40% shareholdings before BHP sold out in 1994 and Shell sold down to 34%. In 2017 Shell sold its entire shareholding. Woodside is one of the most LNG-leveraged companies globally.

Orlen SA is an energy conglomerate that refines and distributes oil in Poland, the Czech Republic, Germany, and Lithuania. Through a group of refineries, it processes crude oil into gasoline, diesel oil, fuel oil, and aviation fuel. The company also produces petrochemicals and products used by chemical companies as feedstock. Additional operations include exploration and production activities in Poland, where it is domiciled, and Canada. Oil products are offered through thousands of service stations, which is supported by logistics infrastructure. This infrastructure includes surface and underground storage depots and a long-distance pipeline network.

Rosneft Oil Co is an integrated oil and gas company in which the Russian government is a majority shareholder. The company explores, produces, refines, transports, and sells oil and gas. The majority of revenue is generated from its oil segment, where crude and refined products are sold to international and domestic markets. Upstream, Rosneft's exploration and production is concentrated in Central Russia, with other fields throughout the country. The majority of its crude oil is exported to Europe and Asia. Downstream, the company has several refineries across Russia, which sell refined products to European and Russian markets. This includes many of Rosneft's filling stations, where the company captures additional revenue from gasoline and diesel fuel sales.

Oil & Natural Gas Corp Ltd is an Indian-based company. It engaged in the exploration, development, and production of crude oil, natural gas, and value-added products. Along with its subsidiaries, the company operates in the following business segments: Refining and Marketing, which derives maximum revenue, Exploration and Production, and Petrochemicals. Geographically, the group derives maximum revenue from India, from its offshore and onshore activities, and is also involved in exploration and production activities outside India.

EQT is an independent natural gas production company. It focuses its operations in the cores of the Marcellus and Utica shales, located in the Appalachian Basin in the Eastern United States. Its main customers include marketers, utilities, and industrial operators in the Appalachian Basin. The company has three reportable segments in production, gathering, and its transmission segment, which is now an operated joint venture with Blackstone. All the firm's operating revenue is generated in the US, with most revenue flowing from the Marcellus Shale field and through the sale of natural gas.