SIC Codes Explained: Targeting the Right Industries Every Time

Every UK company files at least one Standard Industrial Classification (SIC) code when it registers. These five-digit codes describe what the business does, and they're the most reliable free targeting signal available.

Codes are hierarchical. The first two digits are the section (62 for computer programming, say), and the full five digits get specific (62012 for business and domestic software development).

Companies can file several codes, and some file vague ones like 82990 (other business support). Combining codes, and pairing them with keywords in the company name, works far better than relying on a single code.

On Company Explore you can browse the full SIC directory, see live registration counts per code, and build lists that mix codes with location and age filters.