UK SIC 2007 · 09100
Support activities for petroleum and natural gas mining
Support activities for petroleum and natural gas mining is UK SIC code 09100, part of division 09 (Mining support service activities) in the SIC 2007 classification. As of the July 2026 Companies House register, 3,107 active UK companies list 09100 among their SIC codes, and 2,941 list it as their first code.
As of the July 2026 Companies House register, 3,107 active UK companies list 09100 among their SIC codes (2,941 as their first code).
Companies House data refreshed daily. Page reviewed July 2026.
Division 09: Mining support service activities
This division exists for companies that service extraction sites rather than extract anything themselves. In the UK it is dominated by 09100, support activities for petroleum and natural gas, which covers directional drilling, well casing and cementing, derrick erection and related oilfield services. A large share of registrations are personal service companies set up by individual engineers and consultants contracting into North Sea operators, alongside genuine service firms with crews and equipment of their own.
Energy recruiters treat this division as a live map of the contractor market, because a new incorporation usually means an engineer has just gone independent and will need placements. Contractor accountants, IR35 specialists and insurers covering offshore work prospect the same moment. Growth signals matter for the larger service firms, which buy recruitment, certification and logistics support as headcount rises. Given the sector's project-driven cycles, recently filed accounts and confirmation statements help distinguish active contractors from dormant vehicles left over from previous contracts.
Related SIC codes
Who uses this code in B2B outreach
Lead generation for UK recruitment agencies →
Find UK companies hiring or about to hire, filter by SIC, headcount-proxy filing patterns, and incorporation age.
Where SIC 09100 clusters in the UK
About SIC 09100
How many UK companies use SIC code 09100?
3,107 active UK companies include 09100 (Support activities for petroleum and natural gas mining) among their up-to-four registered SIC codes, of which 2,941 list it first. Figures are from the July 2026 Companies House register snapshot, counting active companies only.
Which SIC code should an oil and gas contractor's limited company use?
If your work directly supports drilling or well operations, 09100 is the standard choice and the one most offshore contractors pick. Engineers doing design or consultancy work sometimes use an engineering activities code from division 71 instead. Either is acceptable: you declare your own code at incorporation and nobody at Companies House assesses whether it fits, though agencies and insurers may expect something sector-appropriate.
My contract has ended. Should I change my company's SIC code or make it dormant?
You do not need to change the code between contracts. If the company stops trading entirely you can file dormant accounts, and some owners switch the SIC code to 99999 to reflect that. Updating a code is done on the next confirmation statement, takes effect once filed, and can just as easily be switched back when a new contract starts.
Find UK SIC 09100 companies
Filter Companies House by this code and enrich with verified contact data.
10 free trial leads, no card required.