Defence Activities

Details for Defence Activities

SIC code 84220 is used for businesses carrying out activity in the field of defence activities. 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, 84220 ranks 434th out of 731 five-digit SIC codes, with 1,135 UK companies registered under it, making it a moderately used SIC code with a defined commercial footprint.

This sits within a classification system that has been used in the UK since the 1940s; Companies House filings moved from 4-digit SIC 2003 codes to the current 5-digit SIC 2007 scheme in 2008–2009, bringing the UK register into line with NACE Rev. 2. 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 defence activities services, specialist defence activities providers, operators in related supply chains, or companies supporting customers who need this form of commercial activity. 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. In practical terms, the code helps separate this kind of work from neighbouring sectors that may look similar in search results but involve different trading models, assets, customers or regulatory expectations.

It is also useful for analysts, lenders, marketers and public bodies because it gives a consistent way to group companies by declared activity, even though the description is not a licence, approval or guarantee of what a company actually does day to day. A company using this code might be newly incorporated, dormant, small and owner-managed, or part of a larger group, so the SIC entry should normally be read alongside accounts, confirmation statements, websites and other commercial signals.

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.