UK SIC 2007 · 70100
Activities of head offices
Activities of head offices is UK SIC code 70100, part of division 70 (Activities of head offices; management consultancy activities) in the SIC 2007 classification. As of the July 2026 Companies House register, 30,279 active UK companies list 70100 among their SIC codes, and 26,100 list it as their first code. That makes it the second most used code in its division.
As of the July 2026 Companies House register, 30,279 active UK companies list 70100 among their SIC codes (26,100 as their first code).
Companies House data refreshed daily. Page reviewed July 2026.
Division 70: Activities of head offices; management consultancy activities
On paper this division combines corporate head offices with management consultancy; in practice the consultancy code swamps everything. 70229, management consultancy other than financial management, is one of the most common classifications on the entire register because interim managers, freelance project leads and boutique advisers all reach for it. 70221 covers financial management consulting, 70210 public relations and communications, and 70100 marks genuine head office entities that coordinate group companies rather than trade externally.
The consultancy population splits into personal service companies and real firms, and prospectors need to treat them differently. Accountants, IR35 specialists, contractor insurance providers and umbrella alternatives chase the fresh incorporations, since a new 70229 registration very often means a contractor starting an engagement. Boutique consultancies with staff buy CRM, proposal software and subcontract talent instead. A missing website is normal for one-person entities here, so it is a weak negative signal but a useful filter for separating the two groups.
Related SIC codes
Where SIC 70100 clusters in the UK
About SIC 70100
How many UK companies use SIC code 70100?
30,279 active UK companies include 70100 (Activities of head offices) among their up-to-four registered SIC codes, of which 26,100 list it first. Figures are from the July 2026 Companies House register snapshot, counting active companies only.
Why do so many contractors register under SIC code 70229?
Because it is broad enough to cover almost any professional advisory work, 70229 has become the default for interim managers and consultants setting up personal service companies. There is no vetting: the code is simply what the director declared at incorporation or on a confirmation statement. That breadth is why lists built on 70229 alone mix genuine consultancies with individual contractors across every industry.
What is SIC code 70100 for, and should a trading business use it?
70100 describes head office activities: overseeing and managing other companies in a group, centralised strategy and administration. It suits holding-style entities that direct subsidiaries rather than sell to customers. A business trading in its own right is better served by a code describing what it actually does. You can change codes at any time via the confirmation statement (CS01), and hold up to 4.
Find UK SIC 70100 companies
Filter Companies House by this code and enrich with verified contact data.
10 free trial leads, no card required.