| # | Company | Employees |
|---|---|---|
| 1 |
Direct Line Groupdirectlinegroupcareers.com
Insurance services integration into Aviva plc, focusing on providing updates and news through Aviva's communication channels. |
5,968 |
| 2 |
London South East Collegeslsec.ac.uk
An education and skills development college in South East London, providing high-quality training aligned with industry needs Diverse, supportive community |
874 |
| 3 |
Prospectsshawtrust.org.uk
A social purpose organization focused on challenging inequality and enabling social mobility through employment opportunities for all individuals |
565 |
| 4 |
Retail & Asset Solutions Ltdretailassetsolutions.com
Specializing in retail stocktaking, merchandising, supply chain audit, and inventory management, with a focus on minimizing shrinkage and fraud |
565 |
| 5 |
Excelcareexcelcareholdings.com
A family-run care provider offering individualized, compassionate care to over 2,500 individuals in 32 unique care homes across various locations |
544 |
| 6 |
ERSG Ltdersg-global.com
A global leader in recruitment for energy, renewables, engineering, and construction industries, providing innovative staffing solutions to support sustainability and community development |
484 |
| 7 |
Mytime Activemytimeactive.co.uk
Providing diverse wellbeing activities including swimming, gyms, golf, bowling, and social programs to promote healthier, happier community lives. |
412 |
| 8 |
Bromcombromcom.com
An award-winning IT solutions provider for education, offering cloud-based tools to optimize data management and enhance outcomes for students and staff |
225 |
| 9 | 219 | |
| 10 |
Newton Media Groupnewtonmedia.co.uk
A leading B2B publisher and media house serving senior professionals globally with bespoke publications, market intelligence, industry analysis, and specialized events |
209 |
| 11 |
Cpl UK - Healthcareuk.cpl.com
Provider of healthcare staffing services in the UK, specializing in placing AHPs, Pharmacists, Nurses, and Doctors in NHS and private hospitals through compliance and client-focused approach |
178 |
| 12 |
Guildmore Group Ltdguildmore.com
Design-led family-owned company creating intelligent and imaginative spaces for living and working Specializing in high quality, cost-effective properties for communities to flourish |
172 |
| 13 |
Thackray Williams LLPlinktr.ee
A prominent law firm in South East England providing a wide range of legal services for both individuals and businesses |
152 |
| 14 |
Forester Lifeforesters.com
Financial services organization with a long history, providing life insurance and financial solutions to millions of customers in the UK, US, and Canada |
86 |
| 15 |
Camberford Underwritingcamberford.com
A highly respected insurance underwriting agency providing specialized commercial insurance solutions through tailored products and exceptional service since 1958 |
66 |
| 16 |
ZISHIthezishi.com
Leading provider of financial services training and qualifications for leaders, corporations, and students in all levels of financial markets trading Expert guidance for mastering success |
44 |
| 17 |
Brownhill Insurance Groupbrownhillgroup.co.uk
Dedicated to protecting individuals and businesses with bespoke insurance solutions, including specialized services for art collectors, ensuring peace of mind |
42 |
| 18 |
Churchill Theatrechurchilltheatre.co.uk
The company is a popular 781 seat venue in Bromley hosting a variety of productions, offering a pre-show dining experience, and hosting Creative Learning classes |
41 |
| 19 |
Senator Security Services Ltdsenatorsecurity.co.uk
A leading provider of integrated security services for the Facilities Management sector, offering manned guarding, alarm response, CCTV monitoring, and electronic security solutions |
24 |
| 20 |
Nexere Consultingsynapri.com
Specializing in talent acquisition across various sectors like AI, Cyber Security, FinTech, IT, Public Sector, Research & Innovation, Sustainability, and Telecoms Media Technology |
23 |
| 21 |
STC Energystcenergy.com
A UK-based energy management consultancy offering utility data management, bill validation, energy procurement, software development, compliance services, and training across sectors |
13 |
| 22 |
CSSP Construction Softwarecssp.co.uk
CSSP specializes in designing, installing, and supporting efficient information and cost management systems for the Construction Industry, offering integrated software solutions for various professionals |
12 |
| 23 |
Pixel Lab | HubSpot Elite Partnerpixel-lab.uk
A digital growth marketing agency specializing in HubSpot solutions, tech stack optimization, and leveraging top SaaS providers for client growth |
11 |
| 24 |
TraderMadetradermade.com
Provider of financial market data and analytics to institutional and fintech clients since 1984, enabling accurate decision-making with innovative software |
10 |
| 25 |
OSTC Marketsostc.com
Global derivatives trading firm specializing in high volume, high liquidity spread trading on US, UK, and European futures markets across multiple asset classes |
9 |
| 26 |
D-WAY GLOBAL SERVICESdwayremit.com
The company aims to provide a cost-effective and secure means to send money internationally, ensuring hard-earned funds go further |
2 |
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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