10 Best B2B Data Providers in the UK in 2026

Company data in the United Kingdom begins with Companies House, the statutory register every incorporated business files with. It publishes incorporation records, registered addresses, directors and annual accounts, and assigns each company a Companies House Number that stays constant through rebrands and ownership changes. That number is the backbone most United Kingdom B2B data providers build on: it lets them tie firmographics, contacts and corporate-group links back to a verifiable source rather than a scraped profile.

Coverage is where providers diverge. InfobelPRO's dataset covers 8.8 million companies in the United Kingdom, from active trading businesses to dormant and micro- entities, each keyed to its registry identity and enriched with sector, size, revenue and contact attributes. Read that figure as one provider's addressable universe rather than a national headcount — vendors draw their boundaries differently, which is exactly why record counts are worth comparing side by side rather than taking at face value.

Compliance is the third consideration. Since Brexit the United Kingdom operates under UK GDPR, enforced by the Information Commissioner's Office rather than an EU authority. In practice the checks a buyer runs stay the same: confirm the provider processes business contact data on a documented lawful basis, request a Data Processing Agreement, and verify that opt-out and deletion requests are honoured. A provider that can point to registry sourcing and an ICO-aligned posture carries less risk than one that cannot.

Choosing between United Kingdom providers comes down to four questions.

Start with sourcing. Does the data trace back to Companies House, or is it assembled by scraping websites and social profiles? Registry-sourced records carry a Companies House Number you can verify against the official register; scraped records do not, and they go stale faster. Ask each provider where its fields originate before anything else.

Next, weigh attribute depth against the job. Prospecting needs contacts and firmographics; CRM enrichment needs a stable match key and broad coverage; risk and compliance work needs corporate linkage, financials and directorships. Strength in one area does not imply strength in another — InfobelPRO and Dun & Bradstreet lead on firmographic and financial depth, while Cognism and Lusha are built around contact data.

Third, treat compliance as a buying criterion, not an afterthought. Your provider should process on a documented lawful basis under UK GDPR, supply a Data Processing Agreement, and honour ICO-registered opt-outs — settle that in writing before you commit.

Finally, decide on scope. A local specialist can go deeper on United Kingdom records and edge cases; a multi-country platform fits better when you sell across borders and want one schema, one contract and consistent coverage from Britain into Europe and beyond. Neither wins outright — it depends on whether the United Kingdom is your entire market or one territory among many.

These four questions are the lens we applied when ranking the providers above; the methodology below sets out exactly how we weighed them.