Postal Activities Under Universal Service Obligation

Details for Postal Activities Under Universal Service Obligation

SIC code 53100 is used for businesses carrying out activity in the field of postal activities under universal service obligation. 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, 53100 ranks 282nd out of 731 five-digit SIC codes, with 3,320 UK companies registered under it, making it a mid-tier classification used by a focused group of companies.

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 postal activities under universal service obligation services, specialist postal activities under universal service obligation providers, operators in related supply chains, or companies supporting customers who need this form of commercial activity. 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. 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.

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.