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.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 | 37,600 | ||||
| 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 |
25,000 | |||
| 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 |
23,103 | |||
| 4 |
RBSnatwestgroup.com
Announcement of rebranding from RBS to NatWest Group, encouraging followers to transition to the new company page for updates. |
18,457 | |||
| 5 |
Centricacentrica.com
A leading energy services provider with a focus on sustainability, offering zero carbon electricity to millions of customers through various brands |
18,164 | |||
| 6 |
Smollansmollan.com
Partners with brands and retailers, building solutions that drive growth and create opportunities at the point of purchase. |
13,502 | |||
| 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. |
12,670 | |||
| 8 |
RSK Grouprskgroup.com
Global provider of environmental consultancy and engineering services, integrating innovation and multidisciplinary collaboration to address complex sustainability challenges. |
12,442 | |||
| 9 |
The Weir Group PLCglobal.weir
Global leader providing innovative, efficient, and sustainable mining technology solutions combining engineering, materials science, and intelligent automation expertise. |
10,199 | |||
| 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 |
9,866 | |||
| 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 |
9,410 | |||
| 12 | 8,179 | ||||
| 13 |
SThreesthree.com
Connecting skilled STEM professionals with organizations to drive innovation and solve complex challenges through specialist brands and tailored workforce solutions. |
7,927 | |||
| 14 |
Coventry Universitycoventry.ac.uk
A global university focused on creating better futures through innovative teaching, impactful research, and strong industry partnerships worldwide |
7,430 | |||
| 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. |
7,041 | |||
| 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. |
7,000 | |||
| 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. |
6,843 | |||
| 18 |
SABMillerab-inbev.com
Global brewing company formed by AB InBev and SABMiller merger, producing and distributing beer and beverages worldwide. |
6,716 | |||
| 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 |
5,961 | |||
| 20 |
KELLERkeller.com
A global geotechnical specialist contractor that solves construction challenges with local focus, expertise, and a track record of successful projects |
5,930 | |||
| 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 |
5,799 | |||
| 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. |
5,698 | |||
| 23 |
University of Surreysurrey.ac.uk
Provides diverse undergraduate courses, student support, clubs, and safe accommodation in a vibrant campus environment near London. |
5,511 | |||
| 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 |
5,470 | |||
| 25 |
ScottishPowerscottishpower.com
Leading renewable energy generation, managing electricity grids, and supporting homes and businesses in transitioning to a low carbon future. |
5,295 | |||
| 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 |
5,188 | |||
| 27 | 5,122 | ||||
| 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 |
4,931 | |||
| 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. |
4,902 | |||
| 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. |
4,847 | |||
| 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 |
4,797 | |||
| 32 |
Arriva Grouparrivagroup.com
A leading passenger transport operator in Europe, providing a wide range of transportation services across 10 European countries |
4,733 | |||
| 33 |
RSS Globalrssglobal.com
A portfolio of staffing brands specializing in workforce solutions across various sectors in the UK, Ireland, and Asia Pacific |
4,535 | |||
| 34 |
Interserveinterserve.com
Delivers construction, ground shoring, and justice services worldwide, including equipment services and community rehabilitation, for diverse global clients and communities. |
4,459 | |||
| 35 |
Murphymurphygroup.com
Provides engineering and construction services across transportation, water, power, natural resources, and property sectors in UK, Ireland, and Canada. |
4,078 | |||
| 36 |
McLaren Groupmclaren.com
High-technology brand specializing in Formula 1 racing, high-performance road cars, and advanced technology applications across multiple industries. |
4,025 | |||
| 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 |
3,941 | |||
| 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 |
3,938 | |||
| 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. |
3,935 | |||
| 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 |
3,695 | |||
| 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 |
3,652 | |||
| 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 |
3,635 | |||
| 43 |
Endeavour Miningendeavourmining.com
Senior gold producer operating mines and development projects across West Africa, focusing on responsible mining and sustainable community value. |
3,594 | |||
| 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 |
3,515 | |||
| 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. |
3,501 | |||
| 46 | 3,193 | ||||
| 47 |
City & Guildscityandguilds.com
Providing comprehensive skills training, credentials, and workforce development solutions through a global network to support employment and career growth. |
3,140 | |||
| 48 |
Yorkshire Building Societyybs.co.uk
mutual financial institution managing assets for members, focusing on customer care, community support, and employee well-being. |
3,114 | |||
| 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. |
3,094 | |||
| 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 |
3,080 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 51 |
Stolt-Nielsenstolt-nielsen.com
Global provider of bulk-liquid and chemical logistics, transportation, storage services, and innovative sustainable aquaculture producing premium seafood species. |
3,069 | |||
| 52 | 3,022 | ||||
| 53 |
LNT Grouplntcaredevelopments.co.uk
Group of companies operating in care homes, construction, software, industrial products, and racing, focusing on quality and innovation. |
2,939 | |||
| 54 |
Peninsula UKpeninsulagrouplimited.com
Provides employment law, HR, and health & safety services, including training, tax, payroll, software, and employee assistance programs to businesses. |
2,888 | |||
| 55 |
Persimmon Homespersimmonhomes.com
Construction of affordable homes, providing apprenticeships, manufacturing building materials, ensuring broadband connectivity, and fostering sustainable community development across Britain. |
2,860 | |||
| 56 | 2,848 | ||||
| 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. |
2,787 | |||
| 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. |
2,721 | |||
| 59 |
Advantage Smollanadvantagesmollan.com
Local experts providing consistent service and strong client relationships, leveraging global insights, innovation, and technology for growth. |
2,706 | |||
| 60 |
Renishawrenishaw.com
Engineering and scientific technology company, specializing in precision measurement, healthcare solutions, and additive manufacturing for diverse global industries. |
2,613 | |||
| 61 |
Sumersumer.co.uk
Championing small to medium UK and Ireland businesses by uniting expert firms to provide collaborative support and growth solutions. |
2,608 | |||
| 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 |
2,594 | |||
| 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 |
2,534 | |||
| 64 |
Markerstudy Groupmarkerstudy.com
Specialist in niche motor insurance products targeting unique customer segments, leveraging expert underwriting and strong broker relationships. |
2,498 | |||
| 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 |
2,493 | |||
| 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 |
2,493 | |||
| 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 |
2,487 | |||
| 68 | 2,485 | ||||
| 69 |
IVC Evidensiaivcevidensia.com
Global veterinary group providing comprehensive animal health services focused on improving animal well-being and owner satisfaction worldwide. |
2,471 | |||
| 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 |
2,411 | |||
| 71 |
Blenheim Chalcotblenheimchalcot.com
A venture builder investing in high-growth sectors by providing funds, expertise, and infrastructure to build profitable, scalable companies globally |
2,370 | |||
| 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 |
2,347 | |||
| 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. |
2,326 | |||
| 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 |
2,241 | |||
| 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. |
2,219 | |||
| 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 |
2,218 | |||
| 77 |
Aptia Groupaptia-group.com
Professional services firm combining technology and expertise to simplify pensions, health, and insurance management for businesses and individuals globally. |
2,209 | |||
| 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 |
2,189 | |||
| 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 |
2,147 | |||
| 80 |
ED&F Man Commoditiesedfman.com
Global provider of agricultural commodities including coffee, sugar, molasses, animal feeds, and fish oil with strong sustainability focus. |
2,142 | |||
| 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 |
2,125 | |||
| 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 |
2,124 | |||
| 83 |
Collinson Groupcollinsongroup.com
Global company specializing in travel solutions, airport experiences, loyalty programs, insurance, and customer engagement for millions of consumers worldwide |
2,108 | |||
| 84 |
Sofina Foods Europesofinafoods.com
Production and distribution of high-quality pork and seafood products across Europe, focusing on sustainability, innovation, and customer satisfaction. |
2,067 | |||
| 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 |
2,038 | |||
| 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 |
2,029 | |||
| 87 |
Urenco Globalurenco.com
Supplier of nuclear fuel enrichment services using centrifuge technology, ensuring safe, reliable, and sustainable nuclear fuel supply globally. |
2,027 | |||
| 88 |
FD Technologiesfdtechnologies.com
A data-driven group that offers technology, services in capital markets, and predictive marketing solutions to drive organizations forward globally |
2,025 | |||
| 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 |
2,002 | |||
| 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. |
2,000 | |||
| 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 |
1,984 | |||
| 92 |
Drax Groupdrax.com
Renewable power generation using sustainable biomass, hydro-electric, and pumped storage; global bioenergy supply with carbon negative ambition. |
1,983 | |||
| 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. |
1,933 | |||
| 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. |
1,921 | |||
| 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. |
1,866 | |||
| 96 |
South Staffordshire Plcsouth-staffordshire.com
Integrated services group operating regulated water supply businesses and offering waste, infrastructure, compliance, software, and water logistics solutions. |
1,822 | |||
| 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. |
1,814 | |||
| 98 |
Wessex Waterwessexwater.co.uk
Regional water and sewage treatment services in southwest England, including engineering, construction, property development, waste management, and renewable energy. |
1,765 | |||
| 99 |
10N Collective10ncollective.com
Global collective of urbanism, architecture, and design experts focused on sustainable citymaking, environmental and social responsibility across continents. |
1,735 | |||
| 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 |
1,713 | |||
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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.
More company lists in the United Kingdom
- The largest companies in the United Kingdom 36,548
- Multinational companies in the United Kingdom 7,458
- Financial services firms in the United Kingdom 3,711
- Financial Services companies in the United Kingdom 3,696
- Retail chains in the United Kingdom 3,289
- Professional services firms in the United Kingdom 2,706
- Software Development companies in the United Kingdom 2,600
- Manufacturers in the United Kingdom 2,159
- Companies with in-house R&D in the United Kingdom 1,930
- IT Services and IT Consulting companies in the United Kingdom 1,722
- Retail companies in the United Kingdom 1,596
- IT services companies in the United Kingdom 1,583
- Hotel and hospitality groups in the United Kingdom 1,461
- Companies with a mobile app in the United Kingdom 1,411
- Consulting firms in the United Kingdom 1,298
- E-commerce companies in the United Kingdom 1,246
- Hardware manufacturers in the United Kingdom 1,239
- Family-owned companies in the United Kingdom 1,224
- Hospitality companies in the United Kingdom 1,204
- Critical infrastructure operators in the United Kingdom 1,195
- Wellness and Fitness Services companies in the United Kingdom 1,151
- Retail Apparel and Fashion companies in the United Kingdom 1,085
- Subscription businesses in the United Kingdom 1,077
- Distributors and wholesalers in the United Kingdom 1,060
The same list elsewhere in United Kingdom
- Corporate groups and holding companies in England 578
- Corporate groups and holding companies in Scotland 39
- Corporate groups and holding companies in London 210