Dormant Company

Details for Dormant Company

The code identifies businesses involved in dormant company, whether that is delivered as a core trading operation or as a specialist service line. In plain English, it is likely to include specialist operators, service providers, trading companies, administrative businesses and organisations whose work fits this defined economic activity, with day-to-day activity often involving client delivery, supplier relationships, operational processes, contracts, staff time, equipment and sector-specific administration. As of June 2026, 99999 ranks 11th out of 731 five-digit SIC codes, with 132,770 UK companies registered under it, making it one of the most commonly used SIC codes in the UK.

Companies are not limited to a single activity description: Companies House allows up to four SIC codes, so mixed businesses can show this work alongside complementary trading, advisory, production or support activities. The short official label is deliberately compact, so the real-world businesses behind it may describe themselves using broader phrases such as dormant company services, specialist dormant company providers, operators in related supply chains, or companies supporting customers who need this form of commercial activity. The Standard Industrial Classification has a long UK history, dating back to the 1940s, although the version used for modern company filings changed when Companies House replaced 4-digit SIC 2003 entries with 5-digit SIC 2007 codes in 2008–2009, in step with NACE Rev.

2. The classification is especially valuable when comparing suppliers, prospecting for customers, segmenting a database, reviewing competition or checking how a company presents its principal line of business on the public record. For search and data work, the wording should be understood broadly: companies may use different everyday terms for the same activity, including trade names, sector jargon, abbreviated service descriptions and customer-facing language.

The code therefore works best as a structured indicator of economic activity rather than a complete profile of the company, because many organisations evolve, add services or reorganise after incorporation. Taken together with location, age, filing history and other SIC selections, this code can help build a more rounded view of the market in which the company appears to operate.

Our Recently Formed marketing database is updated daily on the previous days company activity at Companies House to allow you to find new companies quickly and easily (whereas this categorised page of data counts is updated monthly). We provide the widest choice of filters available for Recently Formed Companies. And its not just Newly Formed companies - We have over 4 million companies - from new starters to companies over 100 years old, able to be filtered geographically or by category, but if you are looking to get in touch with companies within this category, the below table shows how many companies were added to the category, month by month over the last couple of years.