Biggest Employers in the UK: Who Tops the List?

The biggest employers in the UK are not the companies most people name. The largest single employer is the National Health Service, which employed an estimated 2.07 million people in June 2026, according to the Office for National Statistics. That's several times larger than any UK-listed firm in terms of employee numbers and, contrary to popular belief, bigger than any bank or well-known high street retailer. 

Of course, that is a different question from asking which company is worth the most. When looking at the number of employees rather than a company’s value or turnover, a very different picture emerges. The biggest employers are often businesses that rely on large numbers of people to deliver their services or manage their operations, whether that involves providing healthcare or running thousands of retail outlets and warehouses.

How the ranking works

Size refers to the number of people directly employed, based on figures recorded annually by public bodies and the Office for National Statistics (ONS), or reported by companies themselves. It is important to note that there is a distinction between ‘headcount’ and full-time equivalent (FTE) jobs. If one person works two-fifths of the time per week, they are one ‘person’ on the total for headcount but 0.4 on FTE. The tables below are based on headcount, as that’s how the vast majority of employers record staff details.

The UK's largest employers, ranked 

Public Sector

The local government figure is the ONS sector total across more than 300 separate councils and includes teachers and support staff in council-maintained schools. 

Private Sector

Figures are rounded and are the latest each employer has published. The Tesco, Asda and Morrisons figures are averages across their financial years, the Tesco figure includes the Republic of Ireland, and the Marks & Spencer figure is a group total that includes staff outside the UK. 

Why the NHS is Britain's biggest employer 

The NHS is not legally one employer. In England alone it is made up of more than 200 separate trusts and boards, and Scotland, Wales and Northern Ireland run their own health services. What makes it top the list is that the ONS counts all of them as a single sector and that nationally negotiated pay scales make them behave much like one employer. 

Its size reflects a fundamental notion of the demand for labour: the demand for workers stems from the demand for what they do. Tesco and Sainsbury's employ people in line with customer numbers and revenues. The NHS employs workers based on clinical need, which depends on the size and age of the population and on government funding decisions rather than on price. There is also limited scope for automation in bedside care. A nurse's presence can't be substituted with capital equipment the way a factory task can. 

It also raises a related question: what happens when one employer dominates demand for a particular job? Economists call this monopsony power. Nurses and paramedics have very few employers to choose from outside the NHS. In a 2025 survey of more than 32,000 practising nurses by the Nursing and Midwifery Council, 82% said their main job was with the NHS or its Northern Ireland equivalent, against 12% working for independent providers (NMC professionals survey, 2025). That gives the NHS greater influence over pay in those roles than would exist in a competitive market. This is one reason why wages and employment in such occupations tend to move together through national pay negotiations, rather than through many employers competing separately; a dynamic that also helps explain broader wage differentials across the UK labour market. 

How concentrated is UK employment?

Big employers are more important than their numbers suggest. At the start of 2025 there were about 5.7 million private sector businesses in the UK, but most employ no one beyond the owner. Just 8,335 had 250 employees or more, about 0.15% of all businesses, yet they accounted for 40% of private sector employment, with SMEs making up the other 60%, according to the government's 2025 estimates of the UK and regional business population. The employers at the top of this list therefore provide a useful starting point for considering how firm size affects wages, collective bargaining, the demand for labour and other aspects of employment.

Employment figures last updated: 7 October 2026. Public sector figures from ONS, September 2026 release. Private sector figures from company reports and statements as of October 2026.