How many businesses are there in the UK?
There are two right answers and they differ by nearly three million, because one counts registered companies and the other counts businesses of every legal form. Which number you want depends entirely on what you are about to do with it.
There is no single number, and the gap between the common answers is close to three million. That is not a rounding problem. The counts measure different things, and picking the wrong one quietly breaks whatever you build on top of it.
The two numbers, and what each one counts
About 5.5 million companies on the public register. This is the Companies House figure: every limited company and LLP currently incorporated in the UK. It is a register count, so it includes dormant companies, holding companies and shells, and it excludes anyone trading without incorporating.
About 5.6 million businesses in total. This is the government's business population estimate, which counts businesses of every legal form: limited companies, ordinary partnerships and the very large number of sole traders. Roughly three in five of those have no employees at all. The size bands inside that figure are broken out in how many small businesses are there in the UK.
The two overlap heavily but are not nested neatly, which is why quoting one with the other's definition is the most common mistake in this area. We go through the traps in how to read ONS business data.
Filter the whole public record to your trade, your patch and your timing, and get each one with the director named and a working email. 25 free to start.
Which number you actually want
It depends on the question:
- Sizing a market you sell into? Usually the business population, because a sole trader is still a customer.
- Building a list you intend to contact? The register, because only an incorporated company has a public record you can trace, filter and verify against.
- Quoting a statistic publicly? Say which one you mean and give the date. Both move every quarter.
There is a practical reason the register wins for prospecting, and it is not that sole traders do not matter. It is that a sole trader has no filing, no registered office and no director on record, so there is nothing to verify a contact against, and under PECR they count as an individual subscriber rather than a corporate one.
How many are actually worth contacting
The headline count is the least useful number in the file. A register count includes:
- dormant companies filing dormant accounts
- holding and special-purpose vehicles with no trading activity
- companies formed and abandoned within the year
- businesses with no website and no discoverable contact
Strip those out and the addressable population for most B2B propositions is a small fraction of the headline. That is a feature, not a disappointment: the filtering is the work, and it is why a list of five million rows is worth less than a list of four hundred companies that match.
The flow matters more than the stock
For most commercial purposes the interesting number is not how many exist but how many appear. Several hundred thousand new companies are registered in the UK each year, and a newly formed company is the one moment when almost every supplier decision is still open.
We keep the live formation figures on the UK company formations tracker, and the annual open-and-close picture is in how many UK businesses open and close each year.
Getting from the count to a list
- Start from the register rather than the population estimate, because it is the only one with records attached.
- Narrow by trade using SIC codes rather than keywords, since the code is what the company itself filed.
- Narrow by place, then by age or filing event.
- Require a verified website and a working email, which removes the dormant and abandoned tail without you having to identify it.
That is the whole journey from "five and a half million" to a number you can actually work through in a week.
Start free with 25 leads and no card.
Common questions
How many companies are registered at Companies House?
Around 5.5 million are on the register at any time, and the figure shifts constantly as companies incorporate and dissolve. It counts every live limited company and LLP, including dormant ones and holding vehicles that never trade, so it is larger than the number of businesses actually operating.
Why is the business population number different?
Because it counts businesses of every legal form rather than only incorporated ones. It includes the very large population of sole traders, who never appear on the Companies House register at all, and around three in five businesses in that count have no employees.
How many UK businesses have no employees?
Roughly three in five of the total business population, which is the single most surprising fact in the data for anyone sizing a B2B market. It means most of the count is one person working for themselves, not the small firms with staff that most propositions are written for.
Which count should I use to size my market?
The business population if sole traders can buy what you sell, and the register if they cannot or if you need to verify and contact each company. Whichever you use, state which one it is and the date it was taken, because both move every quarter and the two are frequently quoted interchangeably.