| # | Company | Employees |
|---|---|---|
| 1 |
Just Group plcjustgroupplc.co.uk
specialist UK financial services group focused on helping people achieve better later life through socially purposeful retirement solutions |
1,349 |
| 2 |
esure Groupesure.com
A leading personal lines insurer providing car, home, and travel insurance through digital innovation, exceptional service, and commitment to environmental sustainability and community impact |
1,101 |
| 3 |
Canon (UK)canon.co.uk
Canon UK offers innovative Commercial Print and technology solutions to transform businesses, increase productivity, simplify workflows, reduce costs, and enhance document security |
929 |
| 4 |
Octavius Infrastructureoctavius.co.uk
A company focused on delivering sustainable and efficient transport solutions through collaboration with customers, suppliers, and developing their people |
644 |
| 5 |
Infinityinfinity.co
A leading call intelligence platform that provides tools to gain insights from conversations, drive sales, optimize marketing, and streamline operations globally |
425 |
| 6 |
Osborneosborne.co.uk
A family-owned UK construction company focused on creating structures and spaces for people to thrive, offering design, project management, contracting, and property maintenance services |
374 |
| 7 |
Surrey Fire and Rescue Servicesurreycc.gov.uk
Emergency response and education services for Surrey, focusing on fire safety, road traffic collisions, water rescues, hazardous materials, and medical emergencies |
361 |
| 8 |
Rugbytots Ltdrugbytots.co.uk
Rugbytots offers a popular and fun rugby play program for children aged 2-7 worldwide, with dedicated franchisees and coaches delivering engaging sessions |
345 |
| 9 |
Reigate & Banstead Borough Councilreigate-banstead.gov.uk
Local government providing housing, environmental health, leisure, planning, waste management, and community support services to residents and businesses. |
340 |
| 10 |
Lindner Prater Ltdlindnerprater.co.uk
Leading UK specialist building envelope contractor providing complete solutions from design to installation for prestigious landmark projects including stadiums, terminals and treatment works. |
340 |
| 11 |
Tesco Underwritingtescounderwriting.com
This company specializes in underwriting car and home insurance policies for a well-known retail brand, operating independently with its own governance |
196 |
| 12 |
ABL 1 Touch Group Ltdabl1touch.com
Tech-enabled accident repair group partnering with Motor Insurers, focused on innovation and quality repairs, providing secure employment for over 350 employees |
168 |
| 13 |
North Airnorthair.co.uk
The company manages 'Into-Plane Fuelling' and tank farms at UK airports for major oil companies, based in Scotland |
164 |
| 14 |
Opus Technologyopustech.co.uk
A leading managed service provider delivering tailored technology solutions, communication services, security services, contact center solutions, and managed print and document management services |
161 |
| 15 |
Active Prospects UKactiveprospects.org.uk
Passionate about independent living, providing high-quality supported living and residential care services for individuals with various disabilities to promote independence and freedom |
149 |
| 16 |
Harry Ramsden's Groupharryramsdens.co.uk
A British restaurant chain with a rich history, Harry Ramsden's focuses on delivering its traditional recipes and exceptional customer experience through passionate staff |
144 |
| 17 |
The Private Healthcare Group Limitedshhhaesthetics.co.uk
The company offers affordable medical aesthetic treatments, charitable clinics for abuse and cancer victims, and aims to provide more affordable private healthcare options |
86 |
| 18 |
Future Proof Ltdfutureproofinsurance.co.uk
A financial services firm providing income protection, critical illness, life insurance, and business protection, with a focus on client wellbeing and unique circumstances |
29 |
| 19 |
Mobile Guardian 馃彨 鈽侊笍馃摬mobileguardian.com
Develops cloud-based solutions, empowering districts, schools, and parents with tools to control, manage, and oversee Android, Chromebook, iOS, and macOS devices for educational environments. |
25 |
| 20 |
RDO Kitchens & Appliances Ltdrdo.co.uk
A trusted independent appliance retailer in the UK, providing top-notch customer experiences and after-sales support to over 250,000 happy customers |
25 |
| 21 |
1st Creditintrum.co.uk
A global financial services company specializing in credit management, debt purchase, and collection, focused on ethical practices and providing positive customer experiences |
21 |
| 22 |
Passenger Plus Ltdpassengerplus.co.uk
The company provides award-winning chauffeur car, minibus, and coach hire services in London and the South East region |
19 |
| 23 |
Coveney Nicholls Chartered Accountantscoveneynicholls.co.uk
A firm of Chartered Accountants offering full range of accountancy, tax planning services for businesses and individuals globally, with inclusive ad hoc advice |
12 |
| 24 |
NU Currencies Ltdnucurrencies.com
Specializing in foreign currency exchange, providing competitive rates and FX hedging strategies for individuals and corporate clients in the UK |
12 |
| 25 |
Inventas Limitedinventas.co.uk
IT, technology, and cybersecurity experts providing cloud IT systems, Microsoft solutions, hardware repairs, and cyber security services, with a focus on customer satisfaction and reliability |
9 |
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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.
The same list elsewhere in United Kingdom
- The largest companies in the United Kingdom 30,833
- The largest companies in England 27,553
- The largest companies in Scotland 1,331
- The largest companies in Wales 473
- The largest companies in Northern Ireland 297
- The largest companies in London 11,154
- The largest companies in Manchester 717
- The largest companies in Birmingham 410
- The largest companies in Leeds 393
- The largest companies in Edinburgh 380
- The largest companies in Glasgow 346
- The largest companies in Cambridge 235
- The largest companies in Nottingham 214
- The largest companies in Liverpool 210
- The largest companies in Bristol 198
- The largest companies in Newcastle upon Tyne 184
- The largest companies in Milton Keynes 181
- The largest companies in Leicester 180
- The largest companies in Sheffield 180
- The largest companies in Reading 169
- The largest companies in Oxford 167
- The largest companies in Cardiff 154
- The largest companies in Coventry 143
- The largest companies in Belfast 137