The global oil and gas industry is powered by a mix of national champions, international majors, specialized independents, and vital service providers. In this list, we’ve put together 100 of the most influential companies shaping the sector today – from state-backed giants with vast reserves to nimble explorers, global refiners, traders, and essential service providers. These are the names driving energy across exploration, production, transportation, refining, and trading.

National oil companies (NOCs) & state-backed integrated leaders

Saudi Aramco

Saudi Arabia’s national oil company is a majority state-owned, fully integrated energy group spanning upstream, refining, and chemicals (including SABIC). It operates the Master Gas System and major fields such as Ghawar (onshore) and Safaniya (offshore), and is headquartered in Dhahran.

Abu Dhabi National Oil Company (ADNOC)

ADNOC is the UAE’s state-owned, integrated energy company (founded 1971), active across upstream, midstream, refining and petrochemicals, with flagship refining at Ruwais. It has pursued capacity expansions and large LNG and low-carbon projects from its Abu Dhabi base.

QatarEnergy

Qatar’s fully state-owned, integrated energy company covers the full oil & gas value chain, with global leadership in LNG anchored by North Field developments. It manages exploration, production, processing, refining, and marketing from Doha.

Kuwait Petroleum Corporation (KPC)

KPC is Kuwait’s state holding company for the entire national oil sector (est. 1980), integrating upstream, downstream and international operations. It oversees the country’s production, refining and global marketing activities.

National Iranian Oil Company (NIOC)

Iran’s state-owned NOC (est. 1951) manages exploration, production and much of the nation’s oil and gas supply chain via a broad network of subsidiaries. It is overseen by the Ministry of Petroleum.

China Petroleum & Chemical Corp (Sinopec)

Sinopec is one of the world’s largest integrated energy and petrochemical groups, with major refining and chemicals operations alongside upstream E&P. It operates domestically and internationally under both the unlisted group and the listed Sinopec Corp.

China National Petroleum Corp (CNPC)

CNPC is China’s state-owned, integrated energy group and parent of PetroChina, with global upstream, pipeline, refining and services businesses. It operates across multiple continents in oil, gas and increasingly new energies.

PetroChina

PetroChina is the publicly listed arm of CNPC and the largest oil and gas producer in China, engaged in E&P, pipelines, refining, marketing and new energy. It remains majority-owned by CNPC.

CNOOC

CNOOC Limited is China’s largest offshore oil and gas producer and one of the world’s biggest pure-play upstream companies, listed in Hong Kong and Shanghai. It focuses on exploration, development and production, with international assets via CNOOC International.

Gazprom

Gazprom is Russia’s majority state-owned energy group centered on natural gas – exploration, production, transmission, storage, processing and power generation – along with oil activities. It is headquartered in St. Petersburg and controls extensive pipeline networks.

Rosneft

Rosneft is Russia’s state-controlled integrated oil company, active across upstream, refining, petrochemicals and marketing. It is a leading refiner in Russia with a large network of plants and operations.

Lukoil

Lukoil is a major vertically integrated Russian oil & gas company with upstream, refining and marketing operations in Russia and abroad. It is one of the world’s largest publicly traded oil companies.

Petrobras

Brazil’s majority state-owned integrated company, Petrobras is known for deepwater and ultra-deepwater expertise in the pre-salt basins, alongside refining, gas & power and marketing activities. Headquarters: Rio de Janeiro.

Pemex

Mexico’s state-owned, fully integrated oil company (founded 1938) engages in exploration, production, refining, logistics and marketing, including ownership of domestic refineries and stakes such as Deer Park in the U.S.

PDVSA

Venezuela’s state-owned oil and gas company operates across exploration, production, refining and export of crude and products, as well as natural gas E&P. It partners with IOCs in various joint ventures.

Ecopetrol

Colombia’s largest integrated energy company (mixed economy/majority state ownership) participates across the value chain: E&P, pipelines/transport, refining and marketing—domestically and with select international assets.

YPF

Argentina’s majority state-owned, vertically integrated energy company spans E&P, refining and marketing, with a leading position in the Vaca Muerta shale. It also develops petrochemicals and power businesses.

PETRONAS

Malaysia’s national oil company (est. 1974) is a fully integrated global energy group active in upstream, LNG, refining, petrochemicals and new energy, with operations in 100+ countries. Headquarters: Kuala Lumpur.

PTT Public Company Limited

Thailand’s state-owned, SET-listed energy holding integrates gas transmission and trading, E&P (via subsidiaries), refining, petrochemicals and retail (including a large service-station network).

Pertamina

Indonesia’s state-owned integrated energy company (created in 1968 from a merger) operates across upstream, refining, petrochemicals, gas and marketing, and manages international assets through sub-holdings.

CPC Corporation, Taiwan

Taiwan’s state-owned integrated oil & gas company handles exploration and production, refining, petrochemicals and lubricants, and is the island’s sole importer/supplier of natural gas.

Indian Oil Corporation (IOC)

India’s largest integrated energy company spans refining, pipelines, marketing, petrochemicals, natural gas and upstream interests, with a nationwide retail footprint. It is a government-owned “Maharatna” PSU.

Bharat Petroleum (BPCL)

BPCL is a majority state-owned, integrated Indian energy company focused on refining and nationwide fuel marketing, with upstream interests and petrochemical expansion plans.

Hindustan Petroleum (HPCL)

HPCL is an Indian public sector refining and marketing company (a subsidiary of ONGC) operating major refineries at Mumbai and Visakhapatnam, plus India’s largest lube base-oil refinery.

Oil and Natural Gas Corporation (ONGC)

India’s state-owned E&P major is the country’s largest oil and gas producer, with operations onshore and offshore and stakes in downstream and international projects.

Nigerian National Petroleum Company (NNPC)

Nigeria’s state-owned energy company—converted to a limited liability company in 2022—operates across the value chain, partnering with IOCs in upstream and overseeing domestic supply and infrastructure.

Sonatrach

Algeria’s national oil company is a fully integrated group across E&P, pipelines, refining, petrochemicals and marketing, and is among Africa’s largest companies by scale.

Sonangol

Angola’s state-owned integrated oil company manages exploration, production, refining, transport and marketing, and partners with IOCs on key offshore developments.

SOCAR (Azerbaijan)

Azerbaijan’s state-owned oil and gas company is active in upstream, processing and marketing, and holds stakes in major export pipelines (e.g., BTC, TANAP/TAP) and downstream assets in Turkey and Europe. 

KazMunayGas

Kazakhstan’s state oil company (founded 2002) represents the state’s interests across upstream, transport (oil and gas), refining and marketing, with stakes in key domestic and regional assets.

International majors & large integrated / refining leaders

ExxonMobil

One of the world’s largest integrated energy companies, active across upstream (including a leading Permian position), refining and chemicals. In May 2024 it completed the $59.5–60B acquisition of Pioneer Natural Resources, creating a dominant unconventional oil & gas business in the Permian Basin.

Chevron

US-based integrated major with material positions in the Permian, Gulf of Mexico, Kazakhstan (Tengiz), Australia LNG (Gorgon/Wheatstone), and a global refining/chemicals footprint. In July 2025 it closed the ~$53–55B acquisition of Hess, adding a 30% stake in Guyana’s Stabroek Block to its portfolio.

Shell

Global integrated energy company with a large LNG production and marketing/trading business alongside upstream, refining, chemicals and retail. In 2022 it unified its share structure, moved its headquarters to London and changed its legal name to Shell plc.

BP

UK-based integrated major operating across upstream, trading, refining, fuels and convenience, and low-carbon businesses. It maintains a long-term net-zero ambition while actively managing its portfolio; recent updates emphasize capital discipline and a sharper upstream focus.

TotalEnergies

French integrated “multi-energy” company spanning oil, gas/LNG, refining, petrochemicals, power and renewables, with a significant global LNG footprint and growing low-carbon portfolio. Headquarters in Paris with operations in ~120 countries.

Eni

Italian integrated energy company active from exploration and production to refining, chemicals and LNG, with a strategy centered on natural gas and decarbonization. Headquartered in Rome with global operations.

Equinor

Norway’s integrated energy company (formerly Statoil), recognized for offshore expertise in the North Sea and growing international oil, gas and renewable projects. It targets long-term value creation in a lower-carbon future.

Repsol

Spain’s integrated multi-energy company across E&P, refining, chemicals, trading and retail. It was the first among majors to set a net-zero-by-2050 target and maintains meaningful upstream positions in places like Brazil.

OMV

Austrian integrated company with three pillars: Energy (upstream & gas), Fuels & Feedstock (refining), and Chemicals (via majority-owned Borealis). In 2025 OMV and ADNOC agreed to combine their polyolefin businesses into “Borouge Group International,” pending approvals.

Galp

Portugal’s integrated energy company with refining & marketing at home and an upstream portfolio focused on Brazil’s pre-salt and LNG-linked projects in Mozambique. It is progressively reallocating capital toward low-carbon opportunities.

MOL Group

Central and Eastern Europe–focused integrated company (Hungary) operating refining/petrochemicals and retail networks (including subsidiaries like Slovnaft in Slovakia and a controlling stake in Croatia’s INA), plus regional upstream. Recent projects include SAF/HVO production at Slovnaft.

Orlen (PKN Orlen)

Poland’s multi-utility energy leader integrating refining, petrochemicals, fuels retail, gas & power after mergers with Grupa LOTOS (Aug 2022) and PGNiG (Nov 2022). The enlarged ORLEN Group is among the largest energy companies in CEE.

Eneos (Japan)

Japan’s largest oil & energy brand (under ENEOS Holdings), operating across refining & marketing, lubricants, chemicals, and upstream interests, with a growing presence in electricity/renewables. The ENEOS name followed the JXTG group rebrand.

Idemitsu Kosan

One of Japan’s leading refiners and petrochemical producers (the country’s #2 refiner), also active in lubricants, basic chemicals and upstream. Idemitsu absorbed Showa Shell in 2019, consolidating its refining network.

SK Innovation

Korea’s SK Group energy & chemicals arm with refining/marketing (SK Energy), petrochemicals (SK geo centric), lubricants (SK enmove), E&P (SK earthon) and batteries (SK On) under its subsidiaries. It also trades crude and products globally.

GS Caltex

Major South Korean refiner and petrochemical producer—an equal joint venture between GS Energy and Chevron—centered on the Yeosu complex with extensive domestic marketing and exports across Asia.

S-OIL

Large Korean refiner and petrochemical company anchored by the Onsan complex; Saudi Aramco is the single largest shareholder, linking S-OIL to upstream supply and petrochemical feedstock integration.

Reliance Industries (Oil-to-Chemicals & E&P)

India’s largest private-sector energy player, operating the Jamnagar site—the world’s largest single-location refining complex—and an integrated O2C chain (refining, aromatics, polymers, fuels). It is investing heavily in new energy (solar, storage, green hydrogen).

Valero Energy

One of the world’s largest independent refiners with 15 refineries across the U.S., Canada and U.K., plus 12 ethanol plants. Through Diamond Green Diesel (a JV with Darling Ingredients), Valero is a leading renewable diesel producer, with SAF capability at Port Arthur.

Marathon Petroleum

The largest U.S. refiner by capacity following its 2018 Andeavor acquisition; core businesses are refining & marketing and midstream (via MPLX). It sold the Speedway retail chain in 2021 to sharpen focus and continues to expand lower-carbon fuels (e.g., renewable diesel at Dickinson).

Independent E&Ps (upstream)

ConocoPhillips

One of the world’s largest independent E&Ps with a global portfolio across the U.S. Lower-48 (notably the Permian and Eagle Ford), Alaska and international assets. In November 2024 it completed the acquisition of Marathon Oil, further scaling its unconventional position.

Occidental Petroleum

U.S. E&P with a major Permian footprint plus Gulf of Mexico and Rockies, and a chemicals arm (OxyChem). It closed the CrownRock acquisition in August 2024 and is building STRATOS, a large Direct Air Capture (DAC) facility in Texas via subsidiary 1PointFive (EPA Class VI sequestration permits approved in 2025).

EOG Resources

A leading shale producer known for “premium drilling” and capital discipline, with multi-basin positions in the Delaware Basin, Eagle Ford, Powder River, and the Dorado gas play in South Texas. Recent investor materials highlight ongoing productivity gains across this diversified portfolio.

Devon Energy

U.S. onshore multi-basin operator with scale in the Delaware Basin (Permian) plus Anadarko and Williston. Widely noted for pioneering a fixed-plus-variable dividend framework that links cash returns to free cash flow.

APA Corporation (Apache)

Houston-based E&P with core positions in the U.S., Egypt (Western Desert), and the North Sea. In October 2024, APA and TotalEnergies sanctioned Block 58 (GranMorgu) offshore Suriname, targeting first oil around 2028.

Marathon Oil

Formerly a U.S. independent with assets in the Eagle Ford, Bakken, Oklahoma and Equatorial Guinea gas, Marathon Oil was acquired by ConocoPhillips on Nov. 22, 2024; operations are now part of ConocoPhillips.

Chesapeake Energy

A major U.S. natural-gas producer focused on Appalachia (Marcellus/Utica) and Haynesville. On Oct. 1, 2024 it merged with Southwestern Energy to form “Expand Energy,” positioning the combined company as the largest U.S. gas producer.

EQT Corporation

Appalachia-focused E&P and one of the largest U.S. natural-gas producers; in April 2025 Reuters described EQT as the country’s second-biggest producer. EQT also acquired Equitrans Midstream in July 2024, creating a more vertically integrated model in the Marcellus/Utica.

Diamondback Energy

Permian Basin pure-play that closed its merger with Endeavor Energy Resources in September 2024, creating one of the largest Midland/Delaware operators with concentrated, contiguous acreage.

Ovintiv

North American multi-basin E&P (formerly Encana) with scale anchored in the Permian (Midland), Anadarko, and Canada’s Montney. Strategy emphasizes liquids-rich development, free cash flow and shareholder returns.

Aker BP

Norway-focused independent that operates the Valhall, Ula, Edvard Grieg/Ivar Aasen, Alvheim and Skarv hubs and holds a stake in Johan Sverdrup. Among Europe’s largest independents by production.

Harbour Energy

UK-based independent that completed the acquisition of Wintershall Dea’s non-Russian E&P portfolio on Sept. 3, 2024, adding positions across Norway, Argentina, Mexico, Germany, Egypt, Algeria and Libya (plus CCS licenses).

Wintershall Dea

Following the sale of most E&P assets to Harbour Energy in Sept. 2024, Wintershall Dea’s remaining group has focused on managing residual businesses and an orderly wind-down. (Historic operations spanned Europe, Latin America and MENA.)

Woodside Energy

Australia’s largest independent energy company and a leading LNG operator via North West Shelf and Pluto LNG. Its Scarborough gas development and Pluto Train 2 are advancing, with first LNG targeted in 2026.

Santos

Australia-headquartered E&P with LNG interests in PNG LNG, GLNG and Darwin LNG, and the Barossa backfill project nearing first gas (2025). In August 2025, Santos extended exclusive due diligence with an ADNOC-led consortium over a proposed acquisition; discussions remain subject to approvals.

Midstream & LNG infrastructure leaders

Enbridge

North American energy infrastructure leader across liquids and natural gas transmission plus gas utilities. In 2024 it closed the purchase of Dominion’s East Ohio Gas, Questar Gas and PSNC – creating the largest natural-gas utility franchise in North America by volume – and it continues to guide to sizable 2025 EBITDA.

TC Energy

Post-spinoff of its Liquids Pipelines business into South Bow on Oct. 1, 2024, TC Energy concentrates on natural gas transmission, storage, and power/energy solutions across Canada, the U.S., and Mexico (systems include NGTL, Canadian Mainline, Columbia Gas/Gulf).

Kinder Morgan

Owns/operates the largest natural-gas pipeline network in North America – about 79,000 miles, transporting ~40% of U.S. natural gas – with connectivity to every major U.S. shale basin, plus products and CO₂ pipelines and storage.

Williams Companies

Operator of Transco, the nation’s largest-volume gas pipeline system (moves ~20% of U.S. natural gas), alongside gathering/processing and other interstate systems. Active expansions include Southeast Supply Enhancement to add ~1.6 MMDth/d to the Southeast.

Enterprise Products Partners

Integrated midstream MLP with a dominant NGL value chain: Permian processing, the Mont Belvieu fractionation/storage hub, and large export terminals (ethane at Morgan’s Point)—plus new projects like the Bahia NGL pipeline and the Neches River (Beaumont) LPG terminal now commissioning.

Energy Transfer

Diversified midstream partnership spanning crude, NGLs, natural gas, and products. It runs large Gulf Coast export hubs (e.g., Nederland—~700,000 b/d NGL export capacity) and has been expanding via deals like WTG Midstream (2024) and additional NGL export capacity announced in 2025.

Cheniere Energy

The leading U.S. LNG producer/exporter, operating Sabine Pass (6 trains, ~30 mtpa via CQP) and Corpus Christi, where Stage 3 achieved first LNG in Dec. 2024 and continued ramp-up in 2025. Strong 2025 results underscore growth as it evaluates further capacity additions.

NOVATEK

Russia’s largest independent natural-gas producer and key LNG player via Yamal LNG; its second project, Arctic LNG 2, has faced U.S./EU sanctions—limiting sales and logistics—even as reports in 2025 indicated output from additional trains.

Commodity trading powerhouses

Vitol

The world’s largest independent energy trader across crude, refined products, gas/LNG, power and carbon. Pairs trading with significant owned/affiliated assets – refining, retail networks, and terminals (incl. VTTI) – and operates globally.

Trafigura

Employee-owned global commodity trader spanning oil/products, metals & minerals, gas and power. Trading is supported by industrial assets such as Nyrstar and majority-owned Puma Energy.

Mercuria

Independent energy and commodities trader active in crude/products, gas & power, LNG, carbon and metals. Combines trading with logistics assets (incl. Minerva Bunkering) and increasing investments in energy-transition businesses.

Oilfield services, drilling & EPC / subsea

SLB (Schlumberger)

The world’s largest oilfield services company, providing reservoir characterization, drilling, completions, and production solutions—plus digital subsurface software and automation. Also active in subsea via OneSubsea and in low-carbon technologies like CCUS and geothermal.

Halliburton

Global services leader focused on well construction and completion—from drilling, cementing and stimulation to production optimization and well intervention. Known for integrated projects that improve recovery and lower lifecycle cost.

Baker Hughes

Energy technology company spanning upstream services and equipment, turbomachinery for LNG/gas, subsea systems, and condition monitoring/digital. Plays a major role in LNG compression and emerging low-carbon solutions (CCUS, hydrogen).

Weatherford

Full-suite services across well construction, completion, artificial lift and intervention, with strengths in tubular running and managed pressure drilling. Emphasis on technologies that enhance well integrity and production efficiency.

TechnipFMC

Specialist in subsea and surface technologies delivering integrated EPCI (iEPCI™) for offshore developments. Provides subsea production systems, flexible pipe, and life-of-field services to lower project cost and time to first oil/gas.

Saipem

Italian EPC/EPCI contractor for offshore and onshore energy projects, including subsea installation and large pipelines. Active in floating production, LNG, and offshore wind foundations.

Subsea 7

Seabed-to-surface engineering and construction company focused on SURF (subsea umbilicals, risers, flowlines), pipelines, and renewables installation. Delivers EPCI projects for complex offshore fields worldwide.

Aker Solutions

Norwegian engineering and technology provider for subsea production systems, topsides, and brownfield modifications. Works across the full project lifecycle with strong North Sea heritage and alliances in subsea.

Wood (John Wood Group)

Global consulting and engineering firm covering concept, design, projects, and O&M across upstream, midstream, downstream, and chemicals. Known for asset integrity, decarbonization, and complex brownfield work.

Worley

Australia-headquartered engineering and professional services company serving hydrocarbons, chemicals, and resources—now heavily focused on sustainability and energy transition projects. Delivers EPCM and advisory across the asset lifecycle.

McDermott

EPCI contractor for offshore and onshore energy, including subsea, LNG, petrochemicals, and storage. Integrates engineering, procurement, fabrication, and installation with global yards and marine spreads.

Fluor

One of the largest EPC firms, executing energy, chemicals, mining, and infrastructure megaprojects. In oil & gas it is known for LNG terminals, refineries, and petrochemical complexes.

Transocean

Offshore drilling contractor specializing in deepwater and ultra-deepwater drillships and semisubmersibles. Strong track record in harsh-environment projects and high-specification rigs.

Valaris

Global offshore driller formed from EnscoRowan, operating a large fleet of jackups and floaters. Focused on safety, high-efficiency operations, and reactivated rigs for improving deepwater demand.

Seadrill

Offshore drilling company with a modern fleet of drillships, semisubs, and premium jackups. Provides deepwater and harsh-environment services to major operators worldwide.

Maxwell Oil Tools

Manufacturer of low-friction composite/ceramic centralizers (e.g., HELIX™, MAXLOCK™) and drillpipe/casing protectors (MAXDRILL®), built on its MCC multilayer composite technology. Tools are designed to cut torque/drag, improve standoff and fluid bypass, and reduce casing wear in challenging wells.

Noble Corporation

Offshore drilling contractor (combined with Maersk Drilling in 2022) operating high-spec drillships, semis, and jackups. Focuses on deepwater efficiency, digitalization, and low-emission rig upgrades.

Helmerich & Payne

Leading U.S. land driller known for FlexRig® technology, automation, and performance drilling in shale basins. Offers drilling solutions, data/remote ops, and rig fleets across North America and select international markets.

Patterson-UTI

Integrated U.S. drilling and completions provider with large land rig fleets and pressure-pumping/fracturing services (combined with NexTier in 2023). Provides turnkey and performance-based solutions across major shale plays.

Nabors Industries

Global land drilling contractor with high-spec rigs, drilling automation, and digital workflows; also active in geothermal drilling and energy transition technologies. Operates across the U.S. and international markets.

NOV (National Oilwell Varco)

Leading manufacturer of oilfield equipment and technology for rigs, wellbore construction, completion tools, and production systems. Supplies critical components, composites, and digital solutions across the drilling lifecycle.

Tenaris

Global producer of seamless and welded steel pipe (OCTG) and related services for drilling and production. Provides rig-direct supply, premium connections, and pipe management to improve well reliability.

Oceaneering International

Subsea engineering and robotics company best known for ROV services, umbilicals, tooling, and integrity management. Supports inspection, maintenance, and remote operations for offshore energy.

SBM Offshore

Leader in FPSO design, leasing, and operations, plus turret mooring and floating production solutions. Strong deepwater track record with long-term lease/operate contracts for major oil & gas projects.

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