| # | Company | Employees |
|---|---|---|
| 1 |
NHS Professionalsnhsprofessionals.nhs.uk
Provision of flexible, cost-effective healthcare staff including nurses, doctors, and administrative professionals to support NHS trusts efficiently. |
5,807 |
| 2 |
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 |
| 3 |
Britvic plcbritvic.com
Leading beverage company with iconic soft drink, beer, and cider brands, exclusive PepsiCo license, serving markets globally with refreshing products. |
2,930 |
| 4 |
NEC Software Solutionsnecsws.com
The company specializes in building software and services that promote safety, health, and connectivity for various organizations and government bodies worldwide |
1,721 |
| 5 |
Havenjobs.haven.com
Leading UK holiday operator with 38 seaside locations, offering diverse opportunities for development and a team of over 9,000 members |
1,417 |
| 6 |
Butlin'sjobs.butlins.com
A company re-inventing the British seaside break with resorts in Minehead, Skegness, and Bognor Regis, providing fun and memorable experiences for millions of families |
1,372 |
| 7 |
Hollywood Bowl Group Plccareers.hollywoodbowlgroup.co.uk
Entertainment company in the UK offering bowling, mini golf, and arcades for special occasions and leisure, focusing on creating memorable experiences for employees and customers |
1,212 |
| 8 |
Tech Unlimitedtechunlimited.co
Specialist IT distributor in the UK, offering protection, accessories, and add-ons for all devices in education and B2B sectors Known for flexibility and quick decision-making |
1,189 |
| 9 |
SOLETRADERsoletrader.co.uk
A long-standing high-street shoe retailer offering a wide range of superior shoe collections for men and women across over 50 stores in the UK |
1,131 |
| 10 | 1,073 | |
| 11 |
Blackhawk Network (BHN) Europeblackhawknetwork.com
Financial technology company providing innovative commercial and engagement solutions globally through a network of gift card sales, payment solutions, and technology |
883 |
| 12 |
Away Resorts Ltdawayresorts.co.uk
A fun, award-winning company shaking up holidays in Great Britain by providing amazing experiences with dedicated and passionate staff |
716 |
| 13 | 578 | |
| 14 |
DEFENSAdefensa.co.uk
A security company established in 2020, specializing in advanced security systems, equipment, and software solutions to ensure safety and reliability for clients |
569 |
| 15 |
Dacorum Borough Councildacorum.gov.uk
Dacorum works to create thriving communities in Hertfordshire, managing housing, elections, and environmental services while promoting work-life balance and innovation |
503 |
| 16 |
Warner Hotelswarnerhotels.co.uk
Luxury hotel group within Bourne Leisure, offering unique experiences in beautiful UK locations with support for career development and teamwork |
459 |
| 17 |
L Lynch Plant Hire & Haulagel-lynch.com
Leading provider of operated and self-drive plant hire, haulage, and transport services for the UK construction industry, focused on delivering projects with skilled professionals |
437 |
| 18 |
Hightownhightownha.org.uk
A charitable housing association providing affordable homes and support services to individuals in need across Hertfordshire, Bedfordshire, Berkshire, and Buckinghamshire |
391 |
| 19 |
Northgate Public Servicesnorthgateps.com
A software solutions company that specializes in public safety technology, serving clients worldwide with a focus on innovation and quality services |
353 |
| 20 |
Martin Brower UK and Irelandmartinbrower.co.uk
Global supply chain solutions provider for restaurant chains, prioritizing customer value, brand protection, and efficient service tailored to individual needs |
312 |
| 21 | 215 | |
| 22 |
GAMA Healthcaregamahealthcare.com
manufacturing and distributing unique infection prevention and control products with training, aftercare support, and global innovation centers |
213 |
| 23 |
SSG Recruitment Partnershipsssgpartnerships.com
This company provides comprehensive support services for recruitment agencies, including business launch assistance, partner support, technology setup, branding, accounting, credit control, and legal support |
211 |
| 24 |
Optomaoptomaeurope.com
Global manufacturer of DLP projectors, LED displays, and interactive flat panels for professional AV installations and high-quality home entertainment systems worldwide. |
201 |
| 25 | 200 | |
| 26 |
Trinity Estatestrinityestates.com
Property management company in England and Wales offering service charge solutions for residential properties, with local teams for personalized and responsive service |
199 |
| 27 |
ALMAYA INTERNATIONAL LIMITEDalmaya.ae
Consumer goods company based in Hemel Hempstead, UK, specializing in a range of products for household and personal use |
195 |
| 28 |
Aesica Pharmaceuticals Ltdrecipharm.com
A leading pharmaceutical CDMO offering end-to-end development and manufacturing services, including API, formulation, manufacturing, packaging, and medical delivery device capabilities |
182 |
| 29 |
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 |
180 |
| 30 |
CAE Technology Services Limited (a boxxe Group Company)boxxe.com
Supporting customers with transformative technology solutions, CAE Technology Services delivers expertise to public and private sectors through long-term trusted partnerships |
180 |
| 31 |
Academia the Technology Groupacademia.co.uk
A fast-growing, award-winning international group of tech companies specializing in software, IT hardware, training, and service solutions for various sectors |
177 |
| 32 |
Chime Housingthrivehomes.org.uk
Thrive Homes provides affordable and social housing in Hertfordshire, Bedfordshire, Buckinghamshire, and Oxfordshire, focusing on customer satisfaction and employee well-being |
173 |
| 33 |
Cards Direct Retail Ltdcardsdirect.co.uk
Family-owned UK retailer specializing in greeting cards, gifts, balloons, and partyware at factory prices Known for outstanding customer service and making people smile |
160 |
| 34 | 110 | |
| 35 |
RedSky - Smarter Construction Softwareredskyit.com
Provides construction companies with software solutions to achieve competitive advantage through real-time visibility, control of change, risk elimination, and operational efficiency Award-winning and part of JDM Technology Group |
92 |
| 36 |
Reserve by Warner Hotelswarnerhotels.co.uk
A 4-star hotel and spa in Egham, Surrey, offering 181 bedrooms, riverside restaurants, meeting rooms, and an award-winning spa for events |
79 |
| 37 |
Birdsall Group Ltdbirdsall.co.uk
An innovative company with a 48-year track record in delivering energy efficiency and environmental solutions, focusing on growth, family values, and sustainability |
77 |
| 38 |
OSPREY LONDONospreylondon.com
British brand offering handcrafted leather accessories for men and women, expanding to lifestyle products and retail with independent stores and online presence |
74 |
| 39 |
Evolt Chargingevoltcharging.co.uk
Leading provider of electric vehicle charging infrastructure, supporting the UK's transition to sustainable mobility with comprehensive solutions, including hardware, software, and maintenance. |
72 |
| 40 |
Cocoon (formerly Druglink)druglink.ltd.uk
A substance misuse charity in Hertfordshire providing addiction treatment, housing solutions, education, and training to change the future for those affected |
51 |
| 41 |
Lorica Insurance Brokerspib-insurance.com
Leading chartered insurance brokers providing risk management services to businesses and individuals, offering bespoke solutions through partnership approach and expertise |
47 |
| 42 |
Free-Work UKfree-work.com
A user-friendly platform supporting IT specialists with resources, job opportunities, and connections for tech talent and contractors in the industry |
42 |
| 43 |
Neurokinexneurokinex.org
A UK non-profit organization and charity dedicated to providing innovative health solutions for individuals living with partial or complete paralysis |
35 |
| 44 |
Synbiotix by SINGUsynbiotix.com
Healthcare technology company delivering modular and scalable solutions to global healthcare organizations for data-driven decision-making, performance improvement, and governance |
32 |
| 45 |
AzteQ Groupazteq.com
A technology partner specializing in delivering digital experiences, prioritizing user needs, and offering end-to-end solutions for businesses to optimize technology investments |
31 |
| 46 |
Apex 360apex360.co.uk
A sports, dance, and physical activity provider focused on social responsibility, promoting health, well-being, inclusivity, and community engagement through innovative programs |
26 |
| 47 |
Just Insurance Brokers (CCV Risk Solutions Ltd t/a)justinsure.co.uk
A professional insurance brokers offering a wide range of insurance products for corporate, commercial, high-net-worth, and personal clients, with access to unique facilities |
16 |
| 48 |
Lumina Technologies Ltdluminatech.co.uk
Providing IT solutions and risk expertise to small-medium businesses in London and Hertfordshire, ensuring infrastructure security, data protection, and operational efficiency |
15 |
| 49 |
Firstline Pharma Ltdfirstlinepharma.co.uk
Global pharma company sourcing, distributing, and supplying branded, generic, and OTC pharmaceuticals worldwide Specializing in clinical trial comparator sourcing and managed access programs |
15 |
| 50 |
Wealth and Finance Matters Ltdwealthandfinancematterslimited.co.uk
A financial planning company focused on reviewing protection plans, savings goals, retirement planning, and making the process simple and worry-free |
14 |
| 51 |
Cadcorpnecsws.com
The company provides GIS software, spatial data, and consultancy services to help organizations make informed decisions using location information |
14 |
| 52 |
DRUGLINKdruglink.co.uk
Specialist substance misuse services for prevention, recovery, and reintegration through education, training, support services, counseling, housing support, and social enterprise initiatives |
14 |
| 53 |
Orion Building Engineering Services Ltdorionbuildingengineering.com
A leading provider of building engineering and support services focused on improving safety, well-being, efficiency, and reliability through exceptional service and expertise |
11 |
| 54 |
Ashendon Recruitment Ltdarlrecruitment.com
A company specializing in local recruitment, providing consultative services with a focus on integrity, excellence, relationship building, team collaboration, and diversity and inclusion |
11 |
| 55 |
articulate.xyzarticulate.xyz
The company offers a voice-driven English language learning service through an app, allowing users to practice speaking clearly without pressure |
10 |
| 56 |
Rees Flooring Limitedreesflooring.com
An independent commercial flooring company with over 50 years of experience, offering high-quality flooring solutions and exceptional customer service nationwide |
9 |
| 57 |
Ariel Communications Limitedarielcommunications.co.uk
Specializing in web and mobile trading software for banks and brokerages, this company offers bespoke solutions and a multi-asset trading platform for FX and CFD brokers |
9 |
| 58 |
Amberside Energyambersideenergy.com
A project developer and asset optimiser for renewable energy, specializing in maximizing income from portfolios and prioritizing grid connections |
8 |
| 59 | 6 | |
| 60 |
Handdels LONDONhanddels.com
Specializing in efficient delivery transportation solutions and event stand building for global blue-chip organizations and SMEs, with a focus on white-glove logistics services |
5 |
| 61 |
Steering Developments Ltdsteeringdevelopments.com
Specializing in mobility solutions, including electric wheelchairs and vehicle conversions, we offer bespoke services tailored to individual needs for personalized accessibility |
5 |
| 62 |
Taholatahola.co.uk
A leading provider of data analytics solutions using technologies like Qlik, IBM, and Power BI, empowering diverse industries to make informed decisions |
4 |
| 63 |
Parashyft Innovations Ltdparashyft-innovations.com
Merchant services provider offering card payment solutions, ePOS systems for hospitality and retail businesses, and electricity and gas contracts for all business sizes |
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
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- The largest companies in Milton Keynes 181
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- The largest companies in Reading 169
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- The largest companies in Cardiff 154
- The largest companies in Coventry 143
- The largest companies in Belfast 137