How to find newly registered UK companies (and why the first week matters)

A company's first week is the least crowded moment in its commercial life. It has no accountant it is loyal to, no bank it has settled on, no software it has paid a year for, and usually no inbox full of suppliers. It also has a director who is, for a few weeks, paying attention to everything. If you sell to small businesses, that window is worth more than any list of established companies, and the UK is one of the few countries that publishes it in full, every day, for free.

Where the data comes from

Every UK company is registered with Companies House, the registrar for England and Wales, Scotland and Northern Ireland. On the day a company is incorporated its record appears on the public register with its name, company number, registered office, company type, incorporation date, the SIC codes describing its intended activity, and the officers and people with significant control named on the application. The register is published under the Open Government Licence, which means anyone can read and reuse it.

There are three ways to get at that daily flow. The Find and update company information service is the official website, built for looking up one company at a time. The Companies House API offers an advanced search endpoint that filters by incorporation date, location and SIC code. And tools built on the API, like Company Signal, present the same records as a browsable directory.

Filter by date first, then narrow

The single most useful filter is the incorporation date. The advanced search accepts an incorporated-from and incorporated-to range; the Company Signal directory offers the last 7, 30 and 90 days as one-click ranges. Start with seven days. A week of UK incorporations is roughly 12,000 companies, which sounds like a lot but narrows fast once you apply a second filter.

• Location. The register stores a registered office address, and the advanced search matches free text against it. Company Signal's city pages do this for the major UK cities. Remember that a registered office is often an accountant's or formation agent's address, so treat it as where the company is registered, not necessarily where it trades.
• Activity. Each company files up to four SIC codes. They are self-declared and not verified, but they are a strong hint. Filtering to the codes your customers use, or to a broad category such as Technology or Construction, removes most of the noise. See UK SIC codes explained.
• Company type. Private companies limited by shares are the overwhelming majority. If you sell to charities or social enterprises, look for companies limited by guarantee and community interest companies instead. Our guide to UK company types covers the differences.

Turn names into a shortlist

A filtered list is still just names. The signal is in the record behind each one. Three things are worth checking before a company earns a place on your shortlist.

1. Who is behind it. One director who is also the sole person with significant control is a founder-led start-up: decisions are quick and the person you email is the person who decides. Several corporate PSCs suggest a subsidiary or a special-purpose vehicle, which is a very different conversation.
2. What it says it will do. Read the SIC descriptions, and the company name. 'Holdings', 'Investments' and 'Property' in the name usually mean a vehicle rather than a trading business.
3. Whether it looks real. A registered office at a known formation-agent address, a director with a dozen other recent appointments, or a name that is a near-copy of an established brand are all reasons to move on.

Make timing your edge

The reason to do this daily rather than monthly is that the value decays. By the time a new company appears in industry lists, has a website indexed and starts advertising, everyone else has found it too. Reading the register in the first week means you are one of a handful of people who know the company exists, and the only one who has read its record. That is a genuinely different first email, and it is the whole point.

Start with the companies registered this week, pick a city or a category, and open three profiles. You will have a feel for the rhythm of the register in ten minutes.