| # | Company | Employees |
|---|---|---|
| 1 | 208,511 | |
| 2 | 85,000 | |
| 3 |
TechnipFMCtechnipfmc.com
A leading technology provider in the energy industry, offering integrated projects and services to develop energy resources while prioritizing sustainability |
25,875 |
| 4 |
Subsea7subsea7.com
Provides offshore services supporting lower-carbon oil and gas evolution, renewable energy growth, and emerging energy solutions for energy transition. |
13,582 |
| 5 |
Vivo Energyvivoenergy.com
A leading energy company in Africa, distributing Shell and Engen branded fuels and lubricants to retail and commercial customers with a focus on safety, innovation, and customer satisfaction |
5,081 |
| 6 |
Oil and Gas Job Search Ltdenergyjobsearch.com
Oil and Gas Job Search is a leading job site connecting over 35 million oil and gas professionals with industry opportunities globally |
4,341 |
| 7 |
Shell Energyshell.com
Support businesses with energy management, cost control, efficiency improvement, and achieving decarbonisation goals for sustainable energy futures. |
4,145 |
| 8 |
Castrolcastrol.com
A global leader in high-performance lubricants for automotive, industrial, marine, and aerospace industries, supplying customers in over 150 countries |
3,927 |
| 9 |
Ensco plcvalaris.com
A global leader in advanced operations, Valaris prioritizes safety, ethics, and innovation to provide lasting value for employees and partners worldwide |
3,604 |
| 10 | 3,036 | |
| 11 |
Borr Drillingborrdrilling.com
Offshore drilling contractor providing worldwide services with premium jack-up rigs for safe, efficient, and sustainable operations in water depths up to 400 feet |
1,947 |
| 12 |
Huntinghuntingplc.com
Global energy services provider to top oil and gas companies, specializing in manufacturing and distributing products for extraction Headquartered in the UK |
1,713 |
| 13 |
Doosan Power Systemsdoosanpowersystems.com
A global company specializing in building, maintaining, and extending the life of power plants worldwide through advanced steam generation, waste-to-energy, and turbine design |
1,300 |
| 14 |
Hydratighthydratight.com
Provides world-class bolted joint solutions and sets international standards in joint integrity, maximizing safety, performance, and efficiency of bolted connections globally. |
1,250 |
| 15 |
Certas Energycertasenergy.co.uk
A leading energy transition business providing fuel and new energy solutions, supporting homes and businesses in the UK's journey to net zero emissions |
1,207 |
| 16 |
Trident Energybit.ly
A leading player in oil and gas, specializing in acquiring and revitalizing mid-life assets, focusing on growth, value creation, sustainability, and community engagement |
1,098 |
| 17 |
EDF Tradingedftrading.com
Management of global energy assets including electricity, gas, oil, and environmental products, providing market access and risk management. |
963 |
| 18 |
EET Fuelseetfuels.com
A key player in Essar Energy Transition, EET Fuels invests in low carbon energy projects, aiming to become UK's first low carbon process refinery |
933 |
| 19 |
Excellence Loggingexlog.com
Specialized mud logging and production services for oil, gas, and geothermal wells, focusing on technology, safety, and cost reduction. |
919 |
| 20 |
KBC A Yokogawa Companykbc.global
A company specializing in Digital Energy Management & Carbon Emissions Management, offering innovative technologies for low-carbon processes and automated surveillance for sustainability goals |
902 |
| 21 |
TNK-BPtnk-bp.com
A company in the oil and gas sector acquired by Rosneft, engaged in the exploration, production, and distribution of oil and natural gas |
888 |
| 22 |
Greenergygreenergy.com
A leading supplier of waste-based renewables and transportation fuels, committed to driving transport decarbonisation through reliable customer service and global supply chain |
879 |
| 23 | 869 | |
| 24 |
px Grouppxlimited.com
Integrated infrastructure solutions business specializing in industrial decarbonization investments, managing and operating energy infrastructure, industrial processes, and leading waste-to-fuels projects internationally |
841 |
| 25 |
Centrica Energycentricaenergy.com
Renewable energy trading company moving energy globally while driving green transition with sustainable costs, fostering a culture of employee engagement and empowerment |
818 |
| 26 |
Assala Energyassalaenergy.com
An energy company in Africa focused on acquiring mature oil and gas assets, increasing production and reserves through field redevelopment |
776 |
| 27 |
Tullow Oiltullowoil.com
Independent oil and gas company with exploration and production licenses in multiple countries, committed to net zero emissions by 2030. |
756 |
| 28 |
AISaisltd.com
Global leader in engineering and manufacturing insulation, passive fire protection systems, buoyancy, and SURF products for energy, industrial, automotive, chemical, and marine sectors |
752 |
| 29 |
Oil & Gas Jobsjobsify.org
Global professional services company offering a wide range of training, development, and consultancy solutions in HR, management, leadership, and various technical and industrial courses worldwide |
728 |
| 30 |
Essar Oil (UK) Limitedeetfuels.com
Leading UK downstream energy company with advanced refinery in Europe, supplying road transport fuels, petrochemicals, and services to major clients |
688 |
| 31 |
Woodattric.co.uk
A leading UK consulting company specializing in technical information, procedural documentation, and engineering support services with international accreditations and a wide range of service offerings across various sectors |
673 |
| 32 |
Gardline Limitedgardline.com
Provides geophysical, geotechnical, and environmental marine surveys for the offshore energy market, offering high-quality data and expert analysis for efficient progress and sustainable growth. |
663 |
| 33 |
SEFE Marketing & Trading Ltdsefe-mt.com
Leading European energy trading company offering physical & financial trading of LNG, gas, power, environmental products, and hydrogen with risk management services |
643 |
| 34 |
Energeanenergean.com
Independent E&P company focused on developing resources in Mediterranean & UK North Sea Committed to sustainable development and being net zero emitter by 2050 |
627 |
| 35 |
KBR / Granhernekbr.com
A leading engineering consultancy specializing in the hydrocarbon and energy industries, offering services in development planning, optimization, project assurance, and technology |
597 |
| 36 |
Severnsevernvalve.com
Manufacturing and supporting high-quality valves for energy industries globally, ensuring reliability, high performance, and minimizing downtime for business-critical infrastructure |
593 |
| 37 |
MESmes-international.com
Specialized technical consultancy in Oil & Gas, Petrochemical, Renewable Energy, and more Provides process safety, risk assessment, environmental, and asset integrity solutions globally |
565 |
| 38 |
Motor Fuel Groupmotorfuelgroup.com
The largest independent forecourt operator in the UK, offering premium fuel brands, competitive forecourt shops, and 'food to go' options from various well-known brands |
536 |
| 39 |
INEOS Energyineos.com
A global chemical, manufacturing, and energy company with a focus on safety, innovation, and sustainability, operating in 31 countries worldwide |
522 |
| 40 |
Acergy
Global seabed-to-surface engineering, construction, and services contractor created through the merger of Acergy and Subsea 7, specializing in subsea solutions |
515 |
| 41 |
British Oil & Gasagency.org.uk
An energy company focusing on exploration, production, and distribution of oil and gas resources in the United Kingdom and beyond |
512 |
| 42 |
SAIPEM LIMITEDonlinecareer360.com
An oil & energy company based in London, UK, specializing in providing industry services and solutions |
508 |
| 43 |
Tracercotracerco.com
Specialized detection, diagnostic, and measurement technologies providing essential data to improve safety, efficiency, and productivity in industries worldwide. |
470 |
| 44 |
GL Noble Dentondnvgl.com
Global provider of risk management services dedicated to safeguarding life, property, and the environment, with a focus on safety, innovation, and sustainability |
423 |
| 45 |
Mitsubishi Power EMEApower.mhi.com
A global leader in thermal power generation systems, Mitsubishi Power Europe provides high quality products and services for a clean, sustainable society |
388 |
| 46 |
Savannah Energysavannah-energy.com
The energy company is focused on delivering significant projects in Cameroon, Nigeria, and Niger, including oil exploration, gas production, and renewable energy initiatives |
358 |
| 47 |
Genesis Oil and Gas Consultants (This page is no longer active)genesisenergies.com
Market-leading consultancy providing engineering and technical services to the global upstream oil and gas industry, offering innovative solutions for E&P projects worldwide |
357 |
| 48 |
Gazprom Marketing & Tradingsefe.eu
A global energy trading organization within the SEFE Group, dedicated to delivering tailored and innovative energy solutions worldwide |
347 |
| 49 | 341 | |
| 50 |
3t | Training Services (UK)3tglobal.com
A leading training provider for energy and safety-critical sectors, offering over 600 courses by industry experts and on-site training globally |
339 |
| 51 |
Fuel Card Services Ltdfuelcardservices.com
Fuel Card Services offers fuel management solutions, including fuel cards and Tele-Gence for intelligent fuel management, to drive down costs and simplify administration |
332 |
| 52 | 325 | |
| 53 |
Glencore UKglencore.com
Global natural resource company involved in sourcing commodities essential for modern life, including oil trading, production, and strategic investments in handling and storage facilities |
321 |
| 54 |
IHS Markit | Energyihsmarkit.com
Leading provider of energy solutions leveraging data, tools, and expertise to offer insights and analytics in oil, gas, coal, power, and renewable energy sectors |
310 |
| 55 |
2H Offshore2hoffshore.com
Specializing in systems engineering for offshore structures in the oil, gas, and renewable energy industries, providing optimal solutions using advanced technology and domain expertise |
309 |
| 56 |
Fulkrumfulkrum.com
Specializing in providing technical personnel for the Energy Industry worldwide, offering inspection, expediting, staffing, and QA/QC services with global coverage |
308 |
| 57 |
Argent Energyargentenergy.com
The company produces eco-friendly fuel to support the global fight against climate change |
296 |
| 58 |
Petroineos Trading Limitedpetroineos.com
Integrated energy trading company supplying crude oil to refineries, trading crude and refined products, operating refineries in Scotland and France. |
290 |
| 59 |
RONTEC Roadside Retail Limited.rontec.com
A market-leading roadside retail company with over 50 years of experience operating 266 petrol stations across England and Wales |
243 |
| 60 |
Javelin Global Commoditiesjavelincommodities.com
Global commodities marketing, trading, logistics, financing, and advisory company with expertise in bulk, steel, energy, green carbon, renewable fuels, and soft commodities Operating globally |
214 |
| 61 |
ScanTech Offshore (part of James Fisher Energy)james-fisher.com
Global provider of well testing equipment, air compressors, steam generators, heat exchangers, and rig cooling deluge equipment, along with qualified personnel for support services |
203 |
| 62 |
Harvest Energyharvestenergy.com
A leading UK-based fuel supplier offering quality products at competitive prices with a customer-focused approach for retail and commercial customers |
195 |
| 63 |
NWF Fuelsnwffuels.co.uk
Fuel supplier with 155+ tankers supplying oil coast-to-coast in England and Wales Emphasizes personal service, emergency deliveries, and surprising new customers |
186 |
| 64 |
BPA - British Pipeline Agency Limitedbpa.co.uk
Develops, engineers, and operates liquid fuel pipelines, terminals, and infrastructure in the UK, providing services to the downstream energy sector worldwide |
180 |
| 65 |
TEi LIMITEDtei.co.uk
A leading UK organization specializing in manufacturing, installing, and maintaining high-pressure steam equipment for energy and process plants in various sectors |
179 |
| 66 |
Oliver Valvesvalves.co.uk
Industry-leading manufacturer of innovative valve solutions for Oil, Gas, and Petrochemical sectors, offering a wide range of high-quality products for various applications |
177 |
| 67 |
Nuclear Industrygoogle.co.uk
Specializes in the nuclear industry, covering all aspects of nuclear, chemical, and engineering fields with expertise and experience |
176 |
| 68 |
PVM Oil Associatestpicap.com
Global leader in brokering oil derivatives, including OTC options and futures contracts, with over 100 million barrels traded daily Founded in 1971 |
172 |
| 69 |
Oil & Gas Consultancyoil-gas.net
A company currently undergoing development and growth, with services or products in progress Watch this space for updates |
171 |
| 70 |
SSE Business Energyssebusinessenergy.co.uk
The company is focused on investing in a greener, more sustainable future by offering 100% green electricity and practical energy solutions for businesses |
168 |
| 71 |
Green'sgreenspower.co.uk
A leading provider of boiler equipment and services, specializing in recovering waste heat efficiently and cutting costs for various industry sectors worldwide |
163 |
| 72 |
Aquaterra Energyaquaterraenergy.com
Provides engineered products and services for offshore well access and developments, supporting efficient operations across oil, gas, and energy transition projects. |
161 |
| 73 |
New Era Energynewera-energy.co.uk
A company providing a range of fuels, oils, and lubricants for various industries with a focus on nationwide delivery, technology, and multiple accreditations |
160 |
| 74 |
Midland Oil Company Ltdmidlandoilcompany.co.uk
Supplying oil and lubricants to commercial, automotive, industrial, and agricultural sectors in the Midlands region for over 20 years |
158 |
| 75 |
PETRA RESOURCES LTD
An oil & energy company located in London, UK, focusing on resource development and operations in the energy sector |
158 |
| 76 |
ODE β DORIS Group Companydorisgroup.com
Rebranded engineering services company offering solutions for the energy industry, including asset management and operations activities in the UKCS |
155 |
| 77 |
Radius | UK Fuelsukfuels.co.uk
Fuel card provider with largest selection in UK, offering access to 3,700+ stations and major brands Part of Radius group providing fleet solutions globally |
152 |
| 78 |
The Oil and Pipelines Agencygov.uk
A public corporation responsible for managing and operating 6 Naval Oil Fuel Depots and 1 Petroleum Storage Depot on behalf of the Secretary of State for Defence |
151 |
| 79 |
Ikon Scienceikonscience.com
Global provider of geopredictive software and services for optimizing subsurface exploration, production, and storage, leveraging deep scientific expertise and technology innovation |
149 |
| 80 |
KPI OceanConnectkpioceanconnect.com
Global provider of marine fuels services and solutions with expertise in the international shipping industry, operating in major maritime hubs worldwide |
148 |
| 81 |
Alderleyalderley.com
Integrated solutions provider for global energy industry, offering advanced digital, mechanical, electrical, and aftermarket solutions to maximize efficiency and value of energy assets |
146 |
| 82 |
Enzen Global Limited - UKenzen.com
A global advisory and engineering practice specializing in energy and utility sectors, providing sustainable solutions and expertise to improve efficiency and performance |
107 |
| 83 |
Amoscoamosco.com
Established in 1978, providing quality inspection services including radiographic and ultrasonic inspections, lifting equipment inspection, manpower services, maintenance and repair services, and training Operations in Africa and the Middle East |
102 |
| 84 |
Inenco Directinencodirect.com
A team of energy specialists with buying power to help businesses save on energy costs, offering tailored solutions and expert advice for free |
101 |
| 85 |
Rider Hunt Internationalrhi-group.com
Specialist company providing information and resources supporting clients across the life cycle of assets, from concept to decommissioning Stay updated on news and career opportunities |
89 |
| 86 |
The Generator Companytgc.uk.com
Global leader in supplying, installing, and servicing industrial generators worldwide, offering maintenance, control systems, spare parts, rental solutions, and technical support |
58 |
| 87 |
NIFES Consulting Groupnifes.co.uk
A company providing solutions in energy efficiency, renewable energy, engineering services, property appraisal, and asset management for clients in various industries |
58 |
| 88 |
Optical Metrology Services Ltdomsmeasure.com
The company specializes in providing innovative technology for pipeline inspection and measurement to ensure integrity and maximize performance in the energy sector |
57 |
| 89 |
LANGLEYS GROUPlangleysgroup.com
A London-based company with expertise in commodities, finance, and luxury real estate, known for professionalism, integrity, and delivering results worldwide |
56 |
| 90 |
Enerfac Solutionsenerfacsolutions.com
A global conglomerate providing smart solutions through digitizing engineering in industrial markets with a focus on safety, quality, and technological innovation |
44 |
| 91 |
Chariot Limitedchariotenergygroup.com
Africa-focused energy group with divisions in transitional gas development, renewable power generation, and green hydrogen projects for sustainable energy solutions |
33 |
| 92 |
Aspect Enterprise Solutionsiongroup.com
Global provider of Commodity Trading and Risk Management, Supply Chain Management, and Real-time Market Information solutions for over 500 companies in 90+ countries |
31 |
| 93 |
Petrocorepetrocoreconsulting.com
An Africa-focused provider of integrated energy solutions, offering cost-effective, sustainable, and energy-efficient options through the asset lifecycle in Sub-Saharan Africa |
27 |
| 94 |
MCL Energy Ltdmclenergy.co.uk
Providing innovative site energy solutions, contract energy management, building services, and installation projects for industrial, commercial, and public sectors |
21 |
| 95 |
GBR Technology Ltdgbrtech.co.uk
Providing high-quality and high-performance products for various industries like paper, automotive, aerospace, motorsport, food, and more for over 40 years |
19 |
| 96 |
Turbine Efficiency Groupturbineefficiencygroup.com
Specializing in gas turbines and power management engineering, this company provides tailored solutions for power introduction, relocation, maintenance, and life extension techniques |
18 |
| 97 |
WKW Precision Engineering Co. Ltd.wkw-eng.co.uk
A top subcontract engineer in Yorkshire, specializing in high tolerance precision components for various industries worldwide with a focus on quality and reliability |
16 |
| 98 |
Maximeyes UK Ltdmaximeyes.me
An award-winning energy consultancy that offers simple solutions to help businesses reduce costs on their utilities |
16 |
| 99 |
InfraStrata Plcinfrastataplc.com
A company specializing in developing strategic infrastructure solutions for safe, secure, and environmentally-sensitive energy storage and delivery facilities, starting with Islandmagee |
16 |
| 100 |
EnerGen Solutions Limitedenergensol.com
EnerGen Solutions specializes in innovative energy solutions, technical asset management, and supply chain optimization to drive sustainability and industry success |
14 |
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How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Oct 24, 2026.
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