UK Business Population Insights, What the Numbers Say About Small Business in 2026

If you work with UK businesses, it helps to understand the market they operate in. And the headline is simple: small businesses still dominate the UK economy.

According to the Department for Business and Trade, there were 5.69 million private sector businesses in the UK at the start of 2025. Of those, 5.64 million were small businesses with 0 to 49 employees, 38,435 were medium-sized, and 8,335 were large. That means SMEs accounted for 99.85% of the UK business population.
Source: Business population estimates for the UK and regions 2025 (GOV.UK)

Where SMEs are most active

The largest number of SMEs were operating in construction, with 885,000 businesses, equal to 16% of all SMEs.

The next biggest group was professional, scientific and technical activities at 819,000 businesses, or 14%.

Wholesale and retail trade came next with 547,000 businesses, or 10%.

Source: Business population estimates for the UK and regions 2025 (GOV.UK)

The role of large businesses

Large businesses make up only a tiny share of the total business population, but they still have a major economic footprint.

At the start of 2025, large businesses accounted for 40% of employment and 49% of turnover in the UK private sector.

The sector with the highest number of large businesses was manufacturing, followed by wholesale and retail trade, and administrative and support service activities.

Source: Business population estimates for the UK and regions 2025 (GOV.UK)

What current SME research tells us

The 2024 Longitudinal Small Business Survey found that 77% of SME employers reported making a profit or surplus in their last financial year.

It also showed a tougher trading picture than in recent years. The most frequently reported obstacle to growth was taxation, VAT, PAYE, National Insurance and business rates.

The same survey found that fewer SME employers reported turnover growth in 2024 than in the previous two years, and fewer expected turnover to grow in the year ahead.

Source: Longitudinal Small Business Survey 2024: SME employers (GOV.UK)

Family-owned firms still matter

Government evidence published in 2026 notes that 75% of SME employers were family-owned in 2023.

That matters because many smaller firms are still built around family involvement, personal responsibility, and long-term commitment rather than layers of corporate structure.

Source: Backing your business: evidence annex (GOV.UK)

Why this matters for insurance

For small businesses, the pressure is rarely just one big risk. It is usually a build-up of smaller gaps.
A business can grow, change premises, add staff, take on new contracts, buy more equipment, hold more stock, or start selling in new ways without properly updating its insurance.

That is where problems can start.

Depending on the business, that might include reviewing:
Public liability
Employers’ liability
Property insurance
Stock and contents cover
Business interruption
Cyber insurance
Terrorism insurance where relevant

Recent ABI guidance is a useful reminder here. It says that being uninsured can mean having no protection against a risk your business faces, while being underinsured can mean having cover in place, but not enough of it for the level of protection you really need.

Source: ABI SME insurance guide (PDF)

Final thought

The UK business population is still shaped by small firms. They make up almost all businesses, support millions of jobs, and operate across every major sector of the economy.

That is exactly why insurance should never be treated as a box-ticking exercise.

When your business changes, your risks can change with it. And when trading conditions are tight, the cost of finding out your cover no longer fits can be far higher than the cost of reviewing it properly.

If you are not sure whether your current insurance still reflects the way your business operates today, it may be worth reviewing it before renewal rather than after a problem arises.

Linked sources

Business population estimates for the UK and regions 2025 (GOV.UK)
Longitudinal Small Business Survey 2024: SME employers (GOV.UK)
Backing your business: evidence annex (GOV.UK)
ABI SME insurance guide, January 2026 (PDF)

This content is for general information only and is not intended to provide advice or a personal recommendation. Insurance cover is subject to the terms, conditions, and exclusions of the policy. Always consider your individual circumstances and seek professional advice before arranging insurance. External websites are not under our control and we are not responsible for their content.