How Companies House Data Powers Smarter B2B Prospecting

Companies House is the UK's registrar of companies. Every limited company, LLP and certain other business entities registered in England, Wales, Scotland and Northern Ireland must file information with Companies House. That information is publicly available, and it's one of the most valuable data sources for B2B prospecting.

What data is available

Companies House maintains detailed records on over 5 million companies. The data includes company profiles, officer information, persons with significant control (PSC) data and filing history.

Company profiles cover the basics: company name, registered number, date of incorporation, registered office address, company status (active, dissolved, in liquidation), SIC codes (industry classification) and company type (Ltd, PLC, LLP). This is foundational firmographic data that helps you identify and filter prospects.

Officer information lists all current and former directors, secretaries and other officers. Each record includes the person's name, date of appointment, date of resignation (if applicable), nationality and occupation. This data is invaluable for identifying decision-makers and understanding a company's leadership structure.

PSC data identifies anyone who holds more than 25% of a company's shares or voting rights, or who otherwise exercises significant control. This can reveal ownership structures, parent-subsidiary relationships and the individuals who ultimately control a business.

Filing history provides a chronological record of all documents filed with Companies House. This includes annual accounts, confirmation statements, changes to directors, changes to registered office, charges (secured lending) and resolutions. Filing history is a rich source of business signals.

Turning data into prospecting intelligence

Raw company data becomes prospecting intelligence when you know what to look for. Several types of changes in Companies House records can signal buying intent or strategic shifts.

Director appointments and resignations often signal strategic change. A new managing director or finance director might bring new priorities, new budgets and new supplier relationships. Multiple director changes in a short period could indicate a restructuring. These are moments when businesses are more receptive to new suppliers and solutions.

Registered office changes can indicate expansion, relocation or consolidation. A company moving from a small office to a larger one is likely growing. A move to a prestigious address might signal an ambition to attract larger clients or investors.

Charge registrations (secured lending) show that a company has taken on debt secured against its assets. This could indicate investment in growth, acquisition activity or working capital needs. For B2B sellers offering solutions that help companies grow or manage cash flow, this is a relevant signal.

Annual accounts, when filed, provide insight into a company's financial health. Turnover, profit, assets and liabilities all help you assess whether a prospect can afford your product and whether they're in a growth phase.

The streaming API

Companies House provides a streaming API that delivers real-time updates as filings are made. Rather than periodically polling for changes, you can subscribe to a continuous stream of events and receive notifications within seconds of a filing.

This is particularly powerful for prospecting. If you're targeting companies in a specific SIC code or region, you can monitor the streaming API for relevant changes and act on them immediately. A new director appointment at a target company today is far more valuable as a prospecting signal than discovering it three months later in a database refresh.

The streaming API covers company events, officer events, PSC events and filing events. It uses HTTP chunked transfer encoding, making it straightforward to integrate with modern data pipelines.

Combining Companies House with other sources

Companies House data is most powerful when combined with other public data sources. Cross-referencing company records with procurement data from Contracts Finder and Find a Tender reveals which companies are active in public sector supply chains. Matching against Charity Commission data identifies third-sector organisations and their commercial activities.

By layering multiple data sources, you can build a comprehensive picture of each prospect. A company that's recently appointed a new IT director, won a government contract and filed accounts showing 30% revenue growth presents a fundamentally different prospecting opportunity from one that's static on all fronts.

Data quality considerations

Companies House data is self-reported by the companies themselves. While there are legal requirements to file accurate information, data quality varies. Some companies file late, some provide minimal information and some records contain errors.

When using Companies House data for prospecting, it's worth cross-referencing key details against other sources. Verify that the company is genuinely active, confirm that listed officers are still in post and check that the registered address is current.

Despite these caveats, Companies House remains the most comprehensive and authoritative source of UK company data. For B2B prospecting teams focused on the UK market, it's an essential foundation for building verified, compliant prospect lists.