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100 leading Oil and Gas companies in England

Tamtam tracks 107 Oil and Gas companies headquartered in England. This list ranks the 100 largest by number of employees on LinkedIn, led by Shell, bp and TechnipFMC. Their median headcount is 339. Half of them were founded in 2000 or later. The most common headquarters are London (42), Gloucester (2) and Reading (2).

πŸ‡¬πŸ‡§ England100 companiesUpdated Oct 24, 2026
#CompanyIndustryHeadquarters EmployeesFounded
1
Shellshell.com

A global energy company with a focus on cleaner energy solutions, serving millions of customers through retail service stations worldwide

Oil and Gas πŸ‡¬πŸ‡§ London 208,511 n/a
2
bpbp.com

Investing in a balanced energy system by transitioning from oil and gas to lower-carbon energy, convenience stores, and power trading

Oil and Gas πŸ‡¬πŸ‡§ London 85,000 1909
3
TechnipFMCtechnipfmc.com

A leading technology provider in the energy industry, offering integrated projects and services to develop energy resources while prioritizing sustainability

Oil and Gas πŸ‡¬πŸ‡§ Newcastle upon Tyne 25,875 n/a
4
Subsea7subsea7.com

Provides offshore services supporting lower-carbon oil and gas evolution, renewable energy growth, and emerging energy solutions for energy transition.

Oil and Gas πŸ‡¬πŸ‡§ London 13,582 2002
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

Oil and Gas πŸ‡¬πŸ‡§ London 5,081 2011
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

Oil and Gas πŸ‡¬πŸ‡§ Stockport 4,341 2000
7
Shell Energyshell.com

Support businesses with energy management, cost control, efficiency improvement, and achieving decarbonisation goals for sustainable energy futures.

Oil and Gas πŸ‡¬πŸ‡§ London 4,145 n/a
8
Castrolcastrol.com

A global leader in high-performance lubricants for automotive, industrial, marine, and aerospace industries, supplying customers in over 150 countries

Oil and Gas πŸ‡¬πŸ‡§ Pangbourne 3,927 1899
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

Oil and Gas πŸ‡¬πŸ‡§ London 3,604 n/a
10
Oil & Gasorg.uk

Specializes in the oil and gas industry, providing services related to exploration, drilling, production, and distribution of petroleum products

Oil and Gas πŸ‡¬πŸ‡§ London 3,036 n/a
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

Oil and Gas πŸ‡¬πŸ‡§ London 1,947 2016
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

Oil and Gas πŸ‡¬πŸ‡§ London 1,713 1874
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

Oil and Gas πŸ‡¬πŸ‡§ Crawley 1,300 n/a
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.

Oil and Gas πŸ‡¬πŸ‡§ Cramlington 1,250 1901
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

Oil and Gas πŸ‡¬πŸ‡§ Warrington 1,207 2001
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

Oil and Gas πŸ‡¬πŸ‡§ London 1,098 2016
17
EDF Tradingedftrading.com

Management of global energy assets including electricity, gas, oil, and environmental products, providing market access and risk management.

Oil and Gas πŸ‡¬πŸ‡§ London 963 1999
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

Oil and Gas πŸ‡¬πŸ‡§ Ellesmere Port 933 n/a
19
Excellence Loggingexlog.com

Specialized mud logging and production services for oil, gas, and geothermal wells, focusing on technology, safety, and cost reduction.

Oil and Gas πŸ‡¬πŸ‡§ London W2 2ES 919 2015
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

Oil and Gas πŸ‡¬πŸ‡§ Walton-on-Thames 902 1979
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

Oil and Gas πŸ‡¬πŸ‡§ London 888 2000
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

Oil and Gas πŸ‡¬πŸ‡§ London 879 1992
23
Afrenafren.com

Independent oil and gas exploration and production company with assets in 11 countries, producing in Nigeria and Kurdistan, and exploring in various African nations

Oil and Gas πŸ‡¬πŸ‡§ London 869 2005
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

Oil and Gas πŸ‡¬πŸ‡§ Stockton-on-Tees 841 2002
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

Oil and Gas πŸ‡¬πŸ‡§ London 818 1998
26
Assala Energyassalaenergy.com

An energy company in Africa focused on acquiring mature oil and gas assets, increasing production and reserves through field redevelopment

Oil and Gas πŸ‡¬πŸ‡§ London 776 2017
27
Tullow Oiltullowoil.com

Independent oil and gas company with exploration and production licenses in multiple countries, committed to net zero emissions by 2030.

Oil and Gas πŸ‡¬πŸ‡§ Chiswick 756 1985
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

Oil and Gas πŸ‡¬πŸ‡§ Gloucester 752 2007
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

Oil and Gas πŸ‡¬πŸ‡§ London 728 2005
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

Oil and Gas πŸ‡¬πŸ‡§ Ellesmere Port 688 n/a
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

Oil and Gas πŸ‡¬πŸ‡§ Hull 673 1963
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.

Oil and Gas πŸ‡¬πŸ‡§ Great Yarmouth 663 n/a
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

Oil and Gas πŸ‡¬πŸ‡§ London 643 n/a
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

Oil and Gas πŸ‡¬πŸ‡§ London 627 2007
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

Oil and Gas πŸ‡¬πŸ‡§ Leatherhead 597 n/a
36
Severnsevernvalve.com

Manufacturing and supporting high-quality valves for energy industries globally, ensuring reliability, high performance, and minimizing downtime for business-critical infrastructure

Oil and Gas πŸ‡¬πŸ‡§ Gloucester 593 1961
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

Oil and Gas πŸ‡¬πŸ‡§ Leatherhead 565 2006
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

Oil and Gas πŸ‡¬πŸ‡§ St Albans 536 2011
39
INEOS Energyineos.com

A global chemical, manufacturing, and energy company with a focus on safety, innovation, and sustainability, operating in 31 countries worldwide

Oil and Gas πŸ‡¬πŸ‡§ London 522 n/a
40
Acergy

Global seabed-to-surface engineering, construction, and services contractor created through the merger of Acergy and Subsea 7, specializing in subsea solutions

Oil and Gas πŸ‡¬πŸ‡§ London 515 n/a
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

Oil and Gas πŸ‡¬πŸ‡§ London 512 n/a
42
SAIPEM LIMITEDonlinecareer360.com

An oil & energy company based in London, UK, specializing in providing industry services and solutions

Oil and Gas πŸ‡¬πŸ‡§ London 508 n/a
43
Tracercotracerco.com

Specialized detection, diagnostic, and measurement technologies providing essential data to improve safety, efficiency, and productivity in industries worldwide.

Oil and Gas πŸ‡¬πŸ‡§ Billingham 470 1958
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

Oil and Gas πŸ‡¬πŸ‡§ London 423 n/a
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

Oil and Gas πŸ‡¬πŸ‡§ London 388 2014
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

Oil and Gas πŸ‡¬πŸ‡§ London 358 2014
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

Oil and Gas πŸ‡¬πŸ‡§ London 357 n/a
48
Gazprom Marketing & Tradingsefe.eu

A global energy trading organization within the SEFE Group, dedicated to delivering tailored and innovative energy solutions worldwide

Oil and Gas πŸ‡¬πŸ‡§ London 347 1999
49
OSRLosrl.com

An industry-owned cooperative providing oil spill response, preparedness, and subsea well intervention services globally, with expertise and facilities in multiple countries

Oil and Gas πŸ‡¬πŸ‡§ Southampton 341 1984
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

Oil and Gas πŸ‡¬πŸ‡§ North Shields 339 2006
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

Oil and Gas πŸ‡¬πŸ‡§ Leeds 332 n/a
52
Praxprax.com

A British global energy conglomerate specializing in crude oil, petroleum products, and biofuels Committed to innovation, sustainability, and customer solutions worldwide

Oil and Gas πŸ‡¬πŸ‡§ London 325 1999
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

Oil and Gas πŸ‡¬πŸ‡§ London 321 n/a
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

Oil and Gas πŸ‡¬πŸ‡§ London 310 1973
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

Oil and Gas πŸ‡¬πŸ‡§ Woking 309 1993
56
Fulkrumfulkrum.com

Specializing in providing technical personnel for the Energy Industry worldwide, offering inspection, expediting, staffing, and QA/QC services with global coverage

Oil and Gas πŸ‡¬πŸ‡§ London 308 2011
57
Argent Energyargentenergy.com

The company produces eco-friendly fuel to support the global fight against climate change

Oil and Gas πŸ‡¬πŸ‡§ Ellesmere Port 296 2003
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.

Oil and Gas πŸ‡¬πŸ‡§ London 290 n/a
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

Oil and Gas πŸ‡¬πŸ‡§ Watford 243 2011
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

Oil and Gas πŸ‡¬πŸ‡§ London 214 2015
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

Oil and Gas πŸ‡¬πŸ‡§ Great Yarmouth 203 1995
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

Oil and Gas πŸ‡¬πŸ‡§ Weybridge 195 1994
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

Oil and Gas πŸ‡¬πŸ‡§ Nantwich 186 1871
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

Oil and Gas πŸ‡¬πŸ‡§ Hemel Hempstead 180 1975
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

Oil and Gas πŸ‡¬πŸ‡§ Wakefield 179 2004
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

Oil and Gas πŸ‡¬πŸ‡§ Knutsford 177 1979
67
Nuclear Industrygoogle.co.uk

Specializes in the nuclear industry, covering all aspects of nuclear, chemical, and engineering fields with expertise and experience

Oil and Gas πŸ‡¬πŸ‡§ Barrow-in-Furness 176 n/a
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

Oil and Gas πŸ‡¬πŸ‡§ London 172 n/a
69
Oil & Gas Consultancyoil-gas.net

A company currently undergoing development and growth, with services or products in progress Watch this space for updates

Oil and Gas πŸ‡¬πŸ‡§ London 171 n/a
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

Oil and Gas πŸ‡¬πŸ‡§ Reading 168 n/a
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

Oil and Gas πŸ‡¬πŸ‡§ Wakefield 163 1821
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.

Oil and Gas πŸ‡¬πŸ‡§ Norwich 161 2005
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

Oil and Gas πŸ‡¬πŸ‡§ Harlow 160 1919
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

Oil and Gas πŸ‡¬πŸ‡§ Leicester 158 2003
75
PETRA RESOURCES LTD

An oil & energy company located in London, UK, focusing on resource development and operations in the energy sector

Oil and Gas πŸ‡¬πŸ‡§ London 158 n/a
76
ODE – DORIS Group Companydorisgroup.com

Rebranded engineering services company offering solutions for the energy industry, including asset management and operations activities in the UKCS

Oil and Gas πŸ‡¬πŸ‡§ Wimbledon 155 2024
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

Oil and Gas πŸ‡¬πŸ‡§ Crewe 152 1990
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

Oil and Gas πŸ‡¬πŸ‡§ London 151 1986
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

Oil and Gas πŸ‡¬πŸ‡§ London 149 2001
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

Oil and Gas πŸ‡¬πŸ‡§ London 148 1971
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

Oil and Gas πŸ‡¬πŸ‡§ Wotton-under-Edge 146 1959
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

Oil and Gas πŸ‡¬πŸ‡§ Solihull 107 n/a
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

Oil and Gas πŸ‡¬πŸ‡§ Eastleigh 102 1978
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

Oil and Gas πŸ‡¬πŸ‡§ Liverpool 101 n/a
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

Oil and Gas πŸ‡¬πŸ‡§ Staines-upon-Thames 89 1988
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

Oil and Gas πŸ‡¬πŸ‡§ Rochester 58 n/a
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

Oil and Gas πŸ‡¬πŸ‡§ Broadheath 58 n/a
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

Oil and Gas πŸ‡¬πŸ‡§ Stansted 57 2004
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

Oil and Gas πŸ‡¬πŸ‡§ London 56 2002
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

Oil and Gas πŸ‡¬πŸ‡§ London 44 n/a
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

Oil and Gas πŸ‡¬πŸ‡§ London 33 n/a
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

Oil and Gas πŸ‡¬πŸ‡§ London 31 1999
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

Oil and Gas πŸ‡¬πŸ‡§ London 27 n/a
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

Oil and Gas πŸ‡¬πŸ‡§ Doncaster 21 1983
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

Oil and Gas πŸ‡¬πŸ‡§ Reading 19 n/a
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

Oil and Gas πŸ‡¬πŸ‡§ Witham St Hughs 18 2000
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

Oil and Gas πŸ‡¬πŸ‡§ Halifax 16 1970
98
Maximeyes UK Ltdmaximeyes.me

An award-winning energy consultancy that offers simple solutions to help businesses reduce costs on their utilities

Oil and Gas πŸ‡¬πŸ‡§ Sutton 16 2004
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

Oil and Gas πŸ‡¬πŸ‡§ London 16 2008
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

Oil and Gas πŸ‡¬πŸ‡§ London 14 2019

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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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