Companies House SIC codes are used to describe the nature of a company's principle business activities and are included on the annual return document. Within Companies House we have hundreds – COT (customer operations team), SIC codes identify the area of business in which you trade. A condensed list of SIC codes for providing Companies House with a description of your company's nature of business. Every UK company must report at least one SIC code – which describes what the business does – to Companies House. This article, which. Companies House · See more information about this guidance. Guidance. Condensed SIC list in CSV format. Updated SIC Code, Description. UK Standard Industrial Classification (UK SIC) Codes Companies House requires 5-digit codes. On the Companies House list, this is shown as A 'SIC code' is a Standard Industrial Classification code. These are used by Companies House to classify the type of economic activity in which. A SIC code is a five-digit Standard Industrial Classification code. They are used by government bodies such as Companies House and the. Limited Companies SIC codes Updated August SIC stands for Standard Industrial Classification of Economic Activities. This is designed to classify.