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Companies House · public register

Companies House verification

Check a UK company number and registered name against the public Find and update company information search. Active register matches return Affix yes or no with a Merkle audit leaf.

CHPublic register
Yes / NoAffix decision
MerkleAudit leaf

Live check

Run companies house check

Source: Companies House Find and update. Every search attaches a fresh Affix Merkle proof.

Eight-character Companies House number.

Must match the register aside from letter case.

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Questions

Does a dissolved company return yes?

No. A correct name on a dissolved record is recognised, but only active registrations return yes.

Is this the official Companies House API?

No. This testing page reads the public HTML search and anchors the Affix decision. Filings remain on GOV.UK.

Where is the Merkle proof?

Each run calls the Affix yesno circuit. The response includes proof digest, merkle root, leaf hash, and inclusion index.