Browse all 731 UK Standard Industrial Classification codes organised by 21 sections. Covering 5,022,372 active companies registered at Companies House.
SIC codes (Standard Industrial Classification) are 5-digit codes used by Companies House and HMRC to classify the business activities of UK companies. Every registered company must provide at least one SIC code that describes its main activity.
There are 731 SIC codes in the UK classification system, organised into 21 sections covering all economic activities from agriculture to international organisations.
Browse the SIC code directory by section to find the category that best matches your business activity. Each code has a description and the number of active UK companies using it, which can help confirm you have selected the correct classification.