| # | Company | Employees |
|---|---|---|
| 1 |
IHG Hotels & Resortsihgplc.com
Management of twenty-one diverse hotel brands across luxury, premium, and essential categories, operating thousands of properties and a major global loyalty program. |
19,288 |
| 2 |
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 |
| 3 |
Independent Consultantlinkedin.com
Provides specialized consulting services independently, offering expertise and insights to clients across various industries to help optimize performance and achieve goals |
16,586 |
| 4 |
British Gasbritishgas.co.uk
Providing affordable energy services and support to millions of UK homes and businesses, focusing on saving energy and money. |
10,311 |
| 5 |
Accelyaw3.accelya.com
A global software provider for airlines, empowering over 200 airlines with innovative solutions to drive growth, enhance customer experience, and control retailing operations |
3,080 |
| 6 |
Morgan Advanced Materialsmorganadvancedmaterials.com
This company specializes in using advanced carbon and ceramics materials to create products that support sustainability, protect lives, and improve quality of life |
2,475 |
| 7 |
Windsor Regional Hospitalwrh.on.ca
A major hospital in Ontario providing advanced care in trauma, cardiac, neurosurgery, mental health, cancer services, and various medical and surgical specialties |
1,957 |
| 8 |
Eton Collegeetoncollege.com
A prestigious boys' boarding school founded in 1440, providing academic excellence, all-round education, and character development in a supportive environment |
749 |
| 9 |
Neilson Financial Servicesneilsonfs.com
An international life insurance provider with offices in multiple countries, focused on helping families secure financial protection for their loved ones |
706 |
| 10 | 605 | |
| 11 |
LEGOLAND Windsor Resortlegoland.co.uk
A family-friendly destination with a unique working experience, part of a top visitor attractions operator worldwide |
595 |
| 12 |
Salutem Care and Educationsalutemcareandeducation.co.uk
Salutem Care and Education provides a wide range of services for children and adults, focusing on personalized support, employee growth, and core values |
544 |
| 13 |
Dyno鈥慠od Plumbing & Drains Serviceslinktr.ee
A leading plumbing and drains company in the UK, offering professional solutions for building maintenance issues 24/7 across the UK and Ireland |
504 |
| 14 |
Areaarea.co.uk
Specializing in creating custom workplace solutions across Europe with a focus on high quality and performance Certified B Corp with commitment to social and environmental standards |
407 |
| 15 |
Otsuka Pharmaceutical Companies Europeotsuka-europe.com
Focus on developing innovative and ethical health solutions addressing challenging physical and mental conditions to improve patients' lives across Europe. |
380 |
| 16 |
Thermal Ceramicsmorganthermalceramics.com
Engineering and manufacturing high-temperature insulating fiber, microporous, and refractory materials for automotive, aerospace, industrial, and commercial building applications. |
373 |
| 17 |
RRrecruitmentrevolution.com
Innovative talent acquisition specialists since 2005, offering a modern approach to recruitment with a focus on relationship-building and organic hiring |
303 |
| 18 |
Centrica Business Solutionscentricabusinesssolutions.com
Balances planet and profit demands, accelerating a low-carbon, cost-efficient future through energy services, supply, and asset development and management worldwide. |
277 |
| 19 |
Keelerkeelerglobal.com
Specializing in manufacturing diagnostic and magnification products for Optical and Healthcare Industries, providing cutting-edge instrumentation and services for accurate and efficient work |
231 |
| 20 |
Square Healthsquarehealth.com
Leading provider of digital healthcare solutions to insurance, corporate, and NHS sectors in the UK Offering mobile app-based services including consultations, screenings, and mental health support |
184 |
| 21 |
ice - The Brand Experience Agencyice-experience.co.uk
Innovative brand experience agency specializing in sustainable event management, interior design, brand creation, and immersive experiences that elevate brands |
184 |
| 22 |
NHS Frimley Integrated Care Boardfrimleyccg.nhs.uk
NHS Frimley Integrated Care Board plans and delivers health and care services collaboratively across five areas within the Frimley Health and Care Integrated Care System |
183 |
| 23 |
Arbonne Independent Consultantarbonne.com
The company offers clean holistic health products to boost confidence, helps individuals start an online business, and turn expenses into income |
175 |
| 24 |
Fairmont Windsor Parkfairmont-windsorpark.com
Luxury hotel in the English countryside near Windsor Great Park and London, offering elegant accommodations, dining options, spa facilities, and outdoor activities Ultimate city escape |
169 |
| 25 |
GenesisCare UKgenesiscare.com
An independent cancer care provider offering advanced diagnostics, medical oncology, radiotherapy, and Theranostics, with a holistic approach and access to innovative treatments |
157 |
| 26 |
DB Consultingesuasive.co.uk
DB Consulting delivers agile software development and project management services, creating web applications, CRM solutions, mobile apps, and data discovery solutions for various industry sectors |
151 |
| 27 |
En Route Internationalen-route.com
A global food service partner for airlines, offering high-quality food, innovative packaging, and operational solutions to enhance the passenger experience |
132 |
| 28 |
Oakley Courtoakleycourt.co.uk
A luxurious country house hotel with 118 bedrooms, a polo team, and a royal visitor, offering a unique getaway on the River Thames near London |
59 |
| 29 |
Cinnamon Cafecinnamoncafe.com
A Windsor-based restaurant founded in 2001, holding exclusive UK rights to its brand name, offering a unique dining experience |
45 |
| 30 |
Cubefundercubefunder.com
This company is an innovative fintech lender for SMEs, providing financial support with flexible repayment plans tailored to business cash flow. |
39 |
| 31 |
Global Expat Payglobalexpatpay.com
The company simplifies global mobility data and payments by integrating multiple vendors into one platform for efficient expat management and accurate payments |
37 |
| 32 |
Freedom Techfreedomtech.co.uk
The company specializes in providing innovative financing solutions for technology purchases in schools and businesses, offering employee benefit programs and managed student technology programs |
30 |
| 33 |
Daniel of Windsordanielstores.co.uk
Family-run independent department store with locations in Royal Windsor and Ealing, offering luxury products, recognized with a Royal Warrant for exceptional service |
30 |
| 34 |
Hire Fitness UKhirefitness.co.uk
The company specializes in home fitness equipment hire and corporate gym solutions, offering professional advice, installation, and fully managed fitness staff services |
26 |
| 35 |
d-flo Limitedd-flo.co.uk
Provides solutions for optimising all client communication journeys, leveraging innovative technology to address common business challenges across various purposes. |
17 |
| 36 |
COGS Accountancy Servicescogs.co.uk
This company offers customized accounting services including invoicing, bookkeeping, and tax planning, providing support and advice for businesses from startup to growth |
14 |
| 37 |
CINNAMON CAF脡cinnamoncafe.com
A Windsor-based restaurant and cafe known for the Bun Run, offering a variety of food and drink options in a cozy atmosphere |
13 |
| 38 |
Nuformanuforma.net
Innovative reformer Pilates system offering self or full service options with added weights, adaptable to various fitness settings for personalized workouts |
9 |
| 39 |
Tikibootikiboo.co.uk
A UK-based online clothing brand specializing in unique fitness and gym wear for women and children, with vibrant designs for various exercises and casual wear |
5 |
| 40 |
Yaseo Digitalyaseo.co.uk
Yaseo specializes in providing innovative digital marketing services to help businesses flourish through brand building, SEO, and website transformation |
3 |
| 41 |
Robosoupdiscover.ai
Acquired by Discoverai, the company offers innovative solutions in the field of robotics and AI technology |
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