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Corporate groups and holding companies headquartered in the United Kingdom

Tamtam tracks 666 corporate groups and holding companies headquartered in the United Kingdom. This list ranks the 100 largest by number of employees on LinkedIn, led by RELX, Balfour Beatty plc and University of Oxford. Their median headcount is 3,080. Half of them were founded in 1970 or later. The most common headquarters are London (31), Manchester (4) and Coventry (2).

πŸ‡¬πŸ‡§ United Kingdom100 companiesUpdated Nov 12, 2026

These are large corporate groups and holding companies in the United Kingdom, primarily based in London, with a strong presence in various sectors. Notably, RELX is a global provider of information-based analytics, Balfour Beatty plc is a global infrastructure group, and the University of Oxford is a leading higher education institution.

The companies listed exhibit a diverse range of industries, including technology, construction, banking, and higher education. A significant pattern observed is the concentration of headquarters in London, with several other major cities like Oxford, Glasgow, and Coventry also hosting large employers.

#CompanyIndustryHeadquarters EmployeesFounded
1
RELXrelx.com

Global provider of information-based analytics for professionals across industries, helping customers make informed decisions through innovative solutions and technologies

Technology, Information and Media πŸ‡¬πŸ‡§ London 37,600 n/a
2
Balfour Beatty plcbalfourbeatty.com

A global infrastructure group with 25,000 employees delivering innovative and efficient transportation, power, building, and utility systems for economic growth and community support

Construction πŸ‡¬πŸ‡§ London 25,000 1909
3
University of Oxfordox.ac.uk

A leading university in various academic disciplines, fostering innovation, entrepreneurship, and social support while upholding respect and banning hate speech

Higher Education πŸ‡¬πŸ‡§ Oxford 23,103 1096
4
RBSnatwestgroup.com

Announcement of rebranding from RBS to NatWest Group, encouraging followers to transition to the new company page for updates.

Banking πŸ‡¬πŸ‡§ Gogarburn 18,457 n/a
5
Centricacentrica.com

A leading energy services provider with a focus on sustainability, offering zero carbon electricity to millions of customers through various brands

Utilities πŸ‡¬πŸ‡§ Windsor 18,164 n/a
6
Smollansmollan.com

Partners with brands and retailers, building solutions that drive growth and create opportunities at the point of purchase.

Retail πŸ‡¬πŸ‡§ London 13,502 1931
7
Bank of Communications Co., Ltd. London Branchbankcomm.com.hk

Provides commercial banking, securities, trust services, financial leasing, fund management, and insurance through a vast network of domestic branches and international overseas institutions.

Banking πŸ‡¬πŸ‡§ 12,670 1908
8
RSK Grouprskgroup.com

Global provider of environmental consultancy and engineering services, integrating innovation and multidisciplinary collaboration to address complex sustainability challenges.

Environmental Services πŸ‡¬πŸ‡§ Helsby 12,442 n/a
9
The Weir Group PLCglobal.weir

Global leader providing innovative, efficient, and sustainable mining technology solutions combining engineering, materials science, and intelligent automation expertise.

Mining πŸ‡¬πŸ‡§ Glasgow 10,199 1871
10
Smiths Group plcsmiths.com

A global pioneer in engineering for over 170 years, improving the world by serving millions and creating a safer, more efficient, and better-connected world

Industrial Machinery Manufacturing πŸ‡¬πŸ‡§ 9,866 1851
11
Informainforma.com

Leading international business in events, digital services, and academic knowledge, connecting specialists worldwide to learn, know, and do more in their fields

Information Services πŸ‡¬πŸ‡§ London 9,410 1998
12
DNEGdneg.com

A global visual entertainment services company acclaimed for its award-winning visual effects work in feature films, television, and multiplatform content

Animation and Post-production πŸ‡¬πŸ‡§ Fitzrovia 8,179 1998
13
SThreesthree.com

Connecting skilled STEM professionals with organizations to drive innovation and solve complex challenges through specialist brands and tailored workforce solutions.

Business Consulting and Services πŸ‡¬πŸ‡§ London 7,927 n/a
14
Coventry Universitycoventry.ac.uk

A global university focused on creating better futures through innovative teaching, impactful research, and strong industry partnerships worldwide

Higher Education πŸ‡¬πŸ‡§ Coventry 7,430 1843
15
NatWestnatwest.com

Provides comprehensive banking services to personal, small business, and SME customers, supports the UK economy through lending to businesses, and fosters entrepreneurship.

Banking πŸ‡¬πŸ‡§ 7,041 n/a
16
Severn Trentseverntrent.com

Provision of clean water and safe wastewater removal for homes, schools, businesses, and hospitals, focusing on community care and quality service.

Utilities πŸ‡¬πŸ‡§ Coventry 7,000 1974
17
David Lloyd Clubsdavidlloyd.co.uk

Largest European health and fitness group operating clubs with gyms, pools, racquet sports, spas, kids facilities, and social spaces for families.

Wellness and Fitness Services πŸ‡¬πŸ‡§ Hatfield 6,843 1982
18
SABMillerab-inbev.com

Global brewing company formed by AB InBev and SABMiller merger, producing and distributing beer and beverages worldwide.

Food and Beverage Services πŸ‡¬πŸ‡§ Woking 6,716 n/a
19
Acacium Grouplinktr.ee

Global healthcare delivery partner with 40+ years experience offering workforce access, technology, and expertise to improve healthcare, social care, and life sciences worldwide

Hospitals and Health Care πŸ‡¬πŸ‡§ London 5,961 n/a
20
KELLERkeller.com

A global geotechnical specialist contractor that solves construction challenges with local focus, expertise, and a track record of successful projects

Construction πŸ‡¬πŸ‡§ London 5,930 n/a
21
Stonegate Groupcareers.stonegatecareers.co.uk

A leading UK pub company with 4,500+ sites nationwide, offering unforgettable experiences, career development, and a focus on teamwork and success

Hospitality πŸ‡¬πŸ‡§ Shirley 5,799 2010
22
Ocado Groupocadogroup.com

Global technology company specializing in online grocery and logistics platforms, enabling partners to excel in ecommerce fulfillment and automation across various industries.

Software Development πŸ‡¬πŸ‡§ Hatfield 5,698 n/a
23
University of Surreysurrey.ac.uk

Provides diverse undergraduate courses, student support, clubs, and safe accommodation in a vibrant campus environment near London.

Higher Education πŸ‡¬πŸ‡§ Guildford 5,511 1891
24
Imperial Tobaccoimperial-tobacco.com

Global tobacco business within Imperial Brands PLC, offering a diverse portfolio of cigarette, cigar, and tobacco brands with a focus on growth and innovation

Tobacco πŸ‡¬πŸ‡§ 5,470 1901
25
ScottishPowerscottishpower.com

Leading renewable energy generation, managing electricity grids, and supporting homes and businesses in transitioning to a low carbon future.

Utilities πŸ‡¬πŸ‡§ Glasgow 5,295 n/a
26
AQAaqa.org.uk

Leading provider of accessible qualifications and support services for teachers and students Sets and marks GCSEs and A-levels in the UK Reinvests profits into research

Education Administration Programs πŸ‡¬πŸ‡§ Manchester 5,188 2000
27
Coatscoats.com

A global leader in thread manufacturing and performance materials, providing innovative, sustainable solutions for apparel, footwear, and other industries worldwide

Textile Manufacturing πŸ‡¬πŸ‡§ London 5,122 1755
28
Bourne Leisure Ltdjobs.haven.com

A leading holiday and holiday home business with parks, resorts, and hotels across the UK focusing on creating unforgettable memories for guests

Travel Arrangements πŸ‡¬πŸ‡§ Hemel Hempstead 4,931 n/a
29
MAG (Airports Group)magairports.com

Ownership and operation of three major UK airports, digital travel services, extensive route network, economic contribution, and sustainability focus.

Airlines and Aviation πŸ‡¬πŸ‡§ Manchester 4,902 2001
30
Cygnetcygnetgroup.com

Providing health and social care services for individuals with mental health needs, brain injuries, eating disorders, autism, and learning disabilities in the UK.

Hospitals and Health Care πŸ‡¬πŸ‡§ London 4,847 1988
31
PZ Cussonspzcussons.com

Global household brand company offering extraordinary products, recognition for talent, and endless opportunities for those with a positive attitude and ambition

Manufacturing πŸ‡¬πŸ‡§ Manchester 4,797 1884
32
Arriva Grouparrivagroup.com

A leading passenger transport operator in Europe, providing a wide range of transportation services across 10 European countries

Ground Passenger Transportation πŸ‡¬πŸ‡§ Sunderland 4,733 1938
33
RSS Globalrssglobal.com

A portfolio of staffing brands specializing in workforce solutions across various sectors in the UK, Ireland, and Asia Pacific

Staffing and Recruiting πŸ‡¬πŸ‡§ London 4,535 n/a
34
Interserveinterserve.com

Delivers construction, ground shoring, and justice services worldwide, including equipment services and community rehabilitation, for diverse global clients and communities.

Construction πŸ‡¬πŸ‡§ Twyford 4,459 n/a
35
Murphymurphygroup.com

Provides engineering and construction services across transportation, water, power, natural resources, and property sectors in UK, Ireland, and Canada.

Civil Engineering πŸ‡¬πŸ‡§ London 4,078 1951
36
McLaren Groupmclaren.com

High-technology brand specializing in Formula 1 racing, high-performance road cars, and advanced technology applications across multiple industries.

Motor Vehicle Manufacturing πŸ‡¬πŸ‡§ Woking 4,025 n/a
37
Noventiqnoventiq.com

A global digital transformation and cybersecurity solutions provider connecting 80,000+ organizations, with a diverse portfolio and active M&A strategy for growth

IT Services and IT Consulting πŸ‡¬πŸ‡§ London 3,941 n/a
38
Wates Groupwates.co.uk

Established in 1897, this leading UK company provides construction, development, and property services to clients in both the public and private sectors

Construction πŸ‡¬πŸ‡§ Leatherhead 3,938 1897
39
Places for Peopleplacesforpeople.co.uk

It is a leading social enterprise in the UK, focusing on community development, housing, leisure, and social impact initiatives.

Real Estate πŸ‡¬πŸ‡§ London 3,935 n/a
40
CareTechcaretech-uk.com

National provider of support for individuals with Autism, Learning Disabilities, Mental Health, and neurological conditions through residential care and in-home services across the UK

Hospitals and Health Care πŸ‡¬πŸ‡§ Uxbridge 3,695 1993
41
Betfredbetfredcareers.com

A leading betting and gaming company with over 50 years of experience, operating in multiple countries, providing innovative services while promoting responsible gambling

Gambling Facilities and Casinos πŸ‡¬πŸ‡§ Birchwood 3,652 1967
42
Galliford Trygallifordtry.co.uk

A UK contractor specializing in building and infrastructure, offering whole life solutions to public and private clients in building, highways, and environmental sectors

Construction πŸ‡¬πŸ‡§ Uxbridge 3,635 n/a
43
Endeavour Miningendeavourmining.com

Senior gold producer operating mines and development projects across West Africa, focusing on responsible mining and sustainable community value.

Mining πŸ‡¬πŸ‡§ London 3,594 2010
44
Admiral Group - MBA Leadership Programsadmiraljobs.co.uk

A company seeking future leaders who can make a difference, inspire teams, and grow into great leaders within a personalized and impactful environment

Financial Services πŸ‡¬πŸ‡§ Cardiff 3,515 1991
45
Vistry Groupvistrygroup.co.uk

Development and delivery of affordable and private homes through partnerships, timber-frame manufacturing, and multiple well-known housing brands in the UK.

Construction πŸ‡¬πŸ‡§ Kent 3,501 2020
46
ZIGUPzigup.com

An integrated mobility solutions platform offering vehicle services across the vehicle life cycle, with a diversified fleet and extensive network

Motor Vehicle Manufacturing πŸ‡¬πŸ‡§ Darlington 3,193 n/a
47
City & Guildscityandguilds.com

Providing comprehensive skills training, credentials, and workforce development solutions through a global network to support employment and career growth.

Education πŸ‡¬πŸ‡§ London 3,140 1878
48
Yorkshire Building Societyybs.co.uk

mutual financial institution managing assets for members, focusing on customer care, community support, and employee well-being.

Financial Services πŸ‡¬πŸ‡§ Bradford 3,114 1864
49
Bookerbookergroupjobs.co.uk

Leading UK food and drink wholesaler with nationwide distribution centres, cash and carry branches, serving pubs, restaurants, hotels, and convenience stores.

Wholesale πŸ‡¬πŸ‡§ Wellingborough 3,094 n/a
50
London South Bank Universitylsbu.ac.uk

Provides engaging courses, industry connections, and real-world experience to empower diverse students to unlock their potential for success in work and life

Higher Education πŸ‡¬πŸ‡§ London 3,080 1892

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51
Stolt-Nielsenstolt-nielsen.com

Global provider of bulk-liquid and chemical logistics, transportation, storage services, and innovative sustainable aquaculture producing premium seafood species.

Transportation, Logistics, Supply Chain and Storage πŸ‡¬πŸ‡§ London 3,069 1959
52
DMGTdmgt.com

Management of companies delivering information, analysis, insight, events, news, and entertainment to businesses and consumers with market leadership.

Information Services πŸ‡¬πŸ‡§ London 3,022 n/a
53
LNT Grouplntcaredevelopments.co.uk

Group of companies operating in care homes, construction, software, industrial products, and racing, focusing on quality and innovation.

Construction πŸ‡¬πŸ‡§ Garforth 2,939 n/a
54
Peninsula UKpeninsulagrouplimited.com

Provides employment law, HR, and health & safety services, including training, tax, payroll, software, and employee assistance programs to businesses.

Human Resources Services πŸ‡¬πŸ‡§ Manchester 2,888 1983
55
Persimmon Homespersimmonhomes.com

Construction of affordable homes, providing apprenticeships, manufacturing building materials, ensuring broadband connectivity, and fostering sustainable community development across Britain.

Construction πŸ‡¬πŸ‡§ York 2,860 1972
56
NLNGnlng.com

Harnessing natural gas resources, producing Liquefied Natural Gas (LNG) and Natural Gas Liquids (NGLs) for export, operating ship chartering and manning services.

Oil and Gas πŸ‡¬πŸ‡§ Port Harcourt 2,848 1989
57
Voyage Care Ltdvoyagecare.com

Provides person-centred care and support for individuals with disabilities and mental health needs across various living and community settings.

Hospitals and Health Care πŸ‡¬πŸ‡§ Lichfield 2,787 1988
58
G's Groupgs-fresh.com

Grows finest quality salads and vegetables, supplying major UK and European retailers with a vast range of fresh, tasty, and healthy produce.

Food and Beverage Manufacturing πŸ‡¬πŸ‡§ Ely 2,721 1952
59
Advantage Smollanadvantagesmollan.com

Local experts providing consistent service and strong client relationships, leveraging global insights, innovation, and technology for growth.

Advertising Services πŸ‡¬πŸ‡§ Winnersh 2,706 n/a
60
Renishawrenishaw.com

Engineering and scientific technology company, specializing in precision measurement, healthcare solutions, and additive manufacturing for diverse global industries.

Automation Machinery Manufacturing πŸ‡¬πŸ‡§ Wotton-under-Edge 2,613 1973
61
Sumersumer.co.uk

Championing small to medium UK and Ireland businesses by uniting expert firms to provide collaborative support and growth solutions.

Accounting πŸ‡¬πŸ‡§ London 2,608 n/a
62
Pixel Unitedpixelunited.com

A global free-to-play mobile games business, part of Aristocrat Leisure Ltd, with a focus on building top games and driving positive change

Computer Games πŸ‡¬πŸ‡§ London 2,594 n/a
63
Willmott Dixonwillmottdixon.co.uk

Privately-owned construction and interior fit-out specialist committed to creating a lasting positive impact through building and community enhancement efforts Exceptional workplace recognized by Sunday Times

Construction πŸ‡¬πŸ‡§ Letchworth Garden City 2,534 1852
64
Markerstudy Groupmarkerstudy.com

Specialist in niche motor insurance products targeting unique customer segments, leveraging expert underwriting and strong broker relationships.

Insurance πŸ‡¬πŸ‡§ Sevenoaks 2,498 2001
65
Travelopiaglobalcareers.travelopia.com

Specializing in extraordinary travel experiences, this company offers diverse and exciting adventures for customers worldwide, inspiring them to seek out new experiences

Travel Arrangements πŸ‡¬πŸ‡§ Surbiton 2,493 2017
66
AXIS (AXIS Capital)axiscapital.com

specialty insurer and reinsurer providing tailored insurance and reinsurance solutions globally, focusing on collaboration, diversity, and responsible business practices

Insurance πŸ‡¬πŸ‡§ Pembroke 2,493 n/a
67
Bellway Homesbellway.co.uk

A leading house builder with a national presence, focusing on regional needs, building quality homes, and contributing positively to local communities

Construction πŸ‡¬πŸ‡§ Newcastle upon Tyne 2,487 1946
68
HFh-f.co.uk

Specialist legal services for insurance claims, supporting SMEs and PLCs with tailored advice and comprehensive claims handling expertise.

Legal Services πŸ‡¬πŸ‡§ Salford 2,485 1969
69
IVC Evidensiaivcevidensia.com

Global veterinary group providing comprehensive animal health services focused on improving animal well-being and owner satisfaction worldwide.

Veterinary Services πŸ‡¬πŸ‡§ Keynsham 2,471 n/a
70
Pertemps Network Grouplinktr.ee

This company has been connecting individuals with the right jobs since 1961, specializing in permanent, temporary, and contract positions across various industries

Staffing and Recruiting πŸ‡¬πŸ‡§ Meriden 2,411 1961
71
Blenheim Chalcotblenheimchalcot.com

A venture builder investing in high-growth sectors by providing funds, expertise, and infrastructure to build profitable, scalable companies globally

Technology, Information and Internet πŸ‡¬πŸ‡§ London 2,370 1998
72
Cohort plccohortplc.com

An AIM listed parent company overseeing six businesses in defence and related markets, focusing on adding value while preserving growth potential

Defense and Space Manufacturing πŸ‡¬πŸ‡§ Theale 2,347 n/a
73
CCH Groupcandchealthcare.co.uk

Providing extensive care services across the UK with 260 sites and 13,000 employees delivering 1.5 million care hours monthly.

Hospitals and Health Care πŸ‡¬πŸ‡§ Nottingham 2,326 n/a
74
The De Beers Group of Companiesdebeersgroup.com

A global leader in the exploration, mining, and marketing of rough diamonds with over a century of unrivaled expertise and experience

Mining & Metals πŸ‡¬πŸ‡§ London 2,241 1888
75
Hachette UKhachette.co.uk

Publishing diverse books including fiction, non-fiction, children's books, educational materials, puzzles, gifts, games, e-books, and audiobooks globally.

Book and Periodical Publishing πŸ‡¬πŸ‡§ London 2,219 n/a
76
Trinity Mirror plctrinitymirror.com

Leading UK multimedia content publisher with a national presence through newspapers and websites, offering news, entertainment, and information to millions

Newspapers πŸ‡¬πŸ‡§ London 2,218 1832
77
Aptia Groupaptia-group.com

Professional services firm combining technology and expertise to simplify pensions, health, and insurance management for businesses and individuals globally.

Professional Services πŸ‡¬πŸ‡§ London 2,209 2023
78
Linnaeuslinnaeusgroup.co.uk

Leading veterinary services group in the UK, backed by Mars Petcare, offering specialist and first opinion veterinary services with a focus on top-quality patient care

Veterinary Services πŸ‡¬πŸ‡§ Shirley 2,189 2014
79
Zen Educatezeneducate.com

This company is revolutionizing education recruitment by saving schools money on agency fees, providing skilled staff, and offering a user-friendly online platform

Education Administration Programs πŸ‡¬πŸ‡§ London 2,147 2017
80
ED&F Man Commoditiesedfman.com

Global provider of agricultural commodities including coffee, sugar, molasses, animal feeds, and fish oil with strong sustainability focus.

International Trade and Development πŸ‡¬πŸ‡§ London 2,142 1783
81
Lanes Grouplanesgroup.com

A diversified wastewater solutions provider offering drainage, rail maintenance, sewer rehabilitation, and environmental services with a focus on innovation and service excellence

Utilities πŸ‡¬πŸ‡§ Leeds 2,125 1992
82
Shaw Trustshawtrust.org.uk

A social purpose organization focused on challenging inequality, providing employment opportunities, and supporting social mobility through various services and support

Non-profit Organizations πŸ‡¬πŸ‡§ London 2,124 1982
83
Collinson Groupcollinsongroup.com

Global company specializing in travel solutions, airport experiences, loyalty programs, insurance, and customer engagement for millions of consumers worldwide

Consumer Services πŸ‡¬πŸ‡§ London 2,108 1989
84
Sofina Foods Europesofinafoods.com

Production and distribution of high-quality pork and seafood products across Europe, focusing on sustainability, innovation, and customer satisfaction.

Food and Beverage Manufacturing πŸ‡¬πŸ‡§ 2,067 n/a
85
Clarion Housing Groupclarionhg.com

providing affordable homes to 360,000 people, building new homes annually, supporting residents through charitable programs focused on work, neighborhoods, and sustainability

Real Estate πŸ‡¬πŸ‡§ London 2,038 2016
86
Huws Grayhuwsgraygroup.co.uk

A leading independent builders merchant in the UK with 249 branches, offering opportunities for career development and a customer-focused approach

Wholesale Building Materials πŸ‡¬πŸ‡§ Llangefni 2,029 1990
87
Urenco Globalurenco.com

Supplier of nuclear fuel enrichment services using centrifuge technology, ensuring safe, reliable, and sustainable nuclear fuel supply globally.

Utilities πŸ‡¬πŸ‡§ London 2,027 1970
88
FD Technologiesfdtechnologies.com

A data-driven group that offers technology, services in capital markets, and predictive marketing solutions to drive organizations forward globally

IT Services and IT Consulting πŸ‡¬πŸ‡§ Newry 2,025 1996
89
London Borough of Barking and Dagenhamlbbd.gov.uk

A growing London borough investing in physical infrastructure, community, housing, a film studio, a university campus, and a Youth Zone Visit website for more information

Government Administration πŸ‡¬πŸ‡§ London 2,002 1965
90
Sir Robert McAlpinesrm.com

Family-owned company specializing in building and infrastructure across the UK, creating future heritage through construction, civil engineering, and project management since 1869.

Construction πŸ‡¬πŸ‡§ Kings Langley 2,000 1869
91
Newsquest Media Groupnewsquest.co.uk

A regional media company in the UK, part of Gannett Inc, with a focus on local news, digital advertising, and marketing solutions

Newspaper Publishing πŸ‡¬πŸ‡§ Newport 1,984 n/a
92
Drax Groupdrax.com

Renewable power generation using sustainable biomass, hydro-electric, and pumped storage; global bioenergy supply with carbon negative ambition.

Utilities πŸ‡¬πŸ‡§ Selby 1,983 n/a
93
GRAHAM Groupgraham.co.uk

Specializes in delivering construction and development projects across the UK and Ireland, encompassing building, civil engineering, interior fit out, facilities management, and investment projects.

Construction πŸ‡¬πŸ‡§ Hillsborough 1,933 1778
94
Islamic Relief Worldwideislamic-relief.org

faith-based agency providing emergency relief, development projects for vulnerable people globally. Tackles poverty, protects communities from disasters, empowers individuals to transform lives.

Non-profit Organizations πŸ‡¬πŸ‡§ Birmingham 1,921 1984
95
NWG (Northumbrian Water Group)nwl.co.uk

Provides water and sewerage services to millions in North East and South East England, focusing on customer service and reliability.

Utilities πŸ‡¬πŸ‡§ Durham 1,866 n/a
96
South Staffordshire Plcsouth-staffordshire.com

Integrated services group operating regulated water supply businesses and offering waste, infrastructure, compliance, software, and water logistics solutions.

Utilities πŸ‡¬πŸ‡§ Walsall 1,822 n/a
97
Lucy Group Ltdlucygroup.com

International group providing sustainable infrastructure, smart energy distribution, advanced street lighting controls, and responsible property development for eco-friendly living.

Appliances, Electrical, and Electronics Manufacturing πŸ‡¬πŸ‡§ Oxford 1,814 1812
98
Wessex Waterwessexwater.co.uk

Regional water and sewage treatment services in southwest England, including engineering, construction, property development, waste management, and renewable energy.

Utilities πŸ‡¬πŸ‡§ Bath 1,765 n/a
99
10N Collective10ncollective.com

Global collective of urbanism, architecture, and design experts focused on sustainable citymaking, environmental and social responsibility across continents.

Architecture and Planning πŸ‡¬πŸ‡§ London 1,735 2025
100
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

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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 Nov 12, 2026.

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