Companies House API for newly registered companies

    The official Companies House API gives you any one company's record. It cannot tell you which companies registered last week in construction in Manchester. NewcoHunter's read-only API can, with a sector, a shell flag, a contactable-by-post flag and a verified website on every record.

    Official API or NewcoHunter API?

    You want toCompanies House APINewcoHunter API
    Look up one company by numberYes, freeYes
    Officers, filings, charges, PSCsYes, full historyOfficers and key dates
    Companies registered this week in a sector and townNo search by sector or locationYes: sector, SIC, postcode, age, type
    Plain-English sector for each companySIC codes onlyYes, 20 sectors and 100 sub-sectors
    Shell-company and postal-reachability flagsNoYes
    Verified website, email, LinkedInNoWhere verified against the registration number
    Matches for your saved searchesNoYes
    Streaming every change on the registerYesNo
    CostFreeBusiness plan, £99 a month

    Endpoints

    All endpoints are read-only and return JSON. Send your key in the Authorization header.

    • GET /api/v1/companies searches the register. Filters: sic_category, postcode, age, company_type, company_status, name, has_website, hide_shells, reachable_by_post, page, limit (max 100).
    • GET /api/v1/companies/:companyNumber returns one company.
    • GET /api/v1/matches returns new companies matching your saved searches. Optional days (1 to 90, default 7) and limit.
    curl -H "Authorization: Bearer nh_your_key_here" \
  "https://www.newcohunter.co.uk/api/v1/companies?sic_category=construction&postcode=M&age=new&limit=5"

    Rate limits are 60 requests a minute and 1,000 a day per key, reported in the standard RateLimit-* headers. Contact fields are returned only where we have verified them, never guessed.

    Frequently asked questions

    Is the Companies House API free?

    Yes. Companies House publishes a free REST API and a streaming API for the whole register; you register for a key on the Companies House developer hub. It gives you the raw record for a company, its officers, filings and charges. What it does not give you is any way to ask for new companies by sector or town, or a sector classification, or a verified website.

    How is the NewcoHunter API different?

    It sits on top of the register and answers the question the official API cannot: which companies registered recently in a given sector and area. Every company carries a plain-English sector, a shell-company flag, a contactable-by-post flag and, where one has been verified against the registration number, a website. It also returns the matches for your saved searches, so an integration can pull exactly what your alerts would have emailed.

    What does the NewcoHunter API cost?

    It is included in the Business plan at £99 a month, which also includes the CRM integrations and unlimited saved searches. Keys are created on the account page. The endpoints are read-only.

    What are the rate limits?

    60 requests a minute and 1,000 a day per key. Every response carries the standard RateLimit headers. A search returns up to 100 companies a page.

    Can I get the data without writing code?

    Yes. Pro plans export any search to CSV or Excel, Zapier and webhooks push new matches to other tools, and anyone can buy a one-off list of a search from £10 without a subscription.

    Keys are created on the account page

    The API is part of the Business plan. Not ready for that? The same data is available as email alerts, CSV export and one-off lists.

    See plansAlerts instead