UK SIC 2007 · 70100
Activities of head offices (SIC code 70100)
Activities of head offices is UK SIC code 70100. It sits in division 70 (Activities of head offices; management consultancy activities) of the SIC 2007 list. On the August 2026 Companies House register, 30,208 active UK companies list 70100 among their SIC codes. 25,982 of them list it first. That makes it the second most used code in its division.
On paper this division mixes corporate head offices with management consultancy. In practice the consultancy code swamps everything. Code 70229, management consultancy other than financial management, is one of the most common classifications on the whole register. Interim managers, freelance project leads and boutique advisers all reach for it. Financial management consulting has its own code, 70221. Public relations and communications use 70210. Code 70100 marks genuine head office entities. Those coordinate group companies rather than sell to outside customers.
Related SIC codes
Who prospects SIC 70100 companies
The consultancy crowd splits in two: personal service companies and real firms. Treat them differently. Accountants, IR35 specialists, contractor insurance providers and umbrella alternatives chase the new incorporations. A new 70229 registration very often means a contractor is starting an engagement. Boutique consultancies with staff buy other things, such as CRM, proposal software and subcontract talent. A one-person entity here often has a thin site or an unfinished one. Website quality is therefore a useful sorting clue, and the poor-website filter helps split the two groups.
Lead generation for consultants →How to read SIC 70100
SIC 70100 is a five-digit code, and the digits are not arbitrary. The first two, 70, are the division, activities of head offices; management consultancy activities. Add the third and you have group 701; the fourth narrows it to a class, and the fifth to the subclass, which is the level Companies House actually asks a company to pick. The whole division sits under section M, professional, scientific and technical activities, the broadest tier there is. Reading a code left to right therefore goes from a whole sector down to one activity.
More on how SIC 70100 is built
A company chooses its own codes when it incorporates and can change them on any confirmation statement. It may list up to four, and Companies House does not check whether they are right. That is why 70100 is worth reading as a claim the company made about itself rather than as a verified fact, and why the first-position and any-position counts above differ.
Measured on the August 2026 register, the busiest registered-office post towns for 70100 are London (7,345), Birmingham (475), Manchester (469), Glasgow (386) and Leeds (363). Those are registered-office locations, which is where the paperwork sits rather than necessarily where the work happens, so treat them as where to start looking rather than as a service area.
Using SIC 70100 as a filter
30,208 companies is 0.58 per cent of the 5,190,464 active companies on the UK register, and ranks 70100 second most used of the 4 codes we track in division 70. That is the pool before any filter. Whether it is a big market for you depends on what you sell, but it is the number every other filter on this page cuts down from.
More on filtering by SIC 70100
Almost everybody who uses 70100 means it: 25,982 of 30,208 companies put it first, leaving only 4,226 carrying it as a secondary code. That makes it an unusually clean filter. You can match on the code alone and trust that the companies you get really are in this line of work.
These companies are spread out. London is the largest single cluster at 24 per cent and the top five post towns together hold only 30 per cent, so the remaining 70 per cent sits across the rest of the country. A regional filter narrows this list without gutting it, which makes it a reasonable code to work territory by territory.
In practice the code on its own is rarely the whole filter. Pair 70100 with an incorporation date to catch companies in their first months, when they are still choosing suppliers, or with a filing deadline to reach them while the year end is on their mind. A worked example for this code: 70100, registered office in London, incorporated in the last ninety days, which turns a 30,208 company pool into a list you can write to in an afternoon. Add the poor-website filter if what you sell is a website, or a recent change of officer if you sell to whoever just took the job. Every company you pull carries the Companies House record, the director's name, a verified website and a verified email, and the ones we cannot complete are not charged.
Where SIC 70100 clusters in the UK
ACTIVE COMPANIES BY REGISTERED-OFFICE POST TOWN · COMPANIES HOUSE REGISTER, AUGUST 2026
SIC 70100 companies, as leads
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About SIC 70100
How many UK companies use SIC code 70100?
30,208 active UK companies list 70100 (Activities of head offices) among their registered SIC codes. Each company may register up to four. Of those, 25,982 put it first. The figures come from the August 2026 Companies House register snapshot, and count active companies only.
Why do so many contractors register under SIC code 70229?
It is broad enough to cover almost any professional advisory work. That made it the default for interim managers and consultants setting up personal service companies. Nobody vets it. The code is simply what the director declared at incorporation or on a confirmation statement. That breadth is also why a list built on 70229 alone mixes real consultancies with individual contractors from every industry.
What is SIC code 70100 for, and should a trading business use it?
Code 70100 describes head office activities. That means overseeing other companies in a group, plus central strategy and administration. It suits holding-style entities that direct subsidiaries rather than sell to customers. A business trading in its own right should use a code describing what it actually does. You can change codes at any time on the confirmation statement (CS01), and hold up to 4.
Find UK SIC 70100 companies
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