About CompanyStack
CompanyStack is a UK Company Intelligence API built by BlackPeak CFO. It provides programmatic access to enriched data on over 5.7 million UK-registered companies sourced from Companies House. The API delivers sub-50ms response times and is designed for developers building fintech applications, credit platforms, due diligence tools, and business intelligence dashboards.
Data & Capabilities
CompanyStack offers 19 RESTful API endpoints covering the full spectrum of UK company information. Key capabilities include:
- Company Search & Autocomplete — full-text search across 5.7M+ companies, filterable by status, SIC code, and postcode.
- Health Scores — AI-computed scores from 0–100 with letter grades (A–F) for instant company viability assessment.
- Filing History — real-time filing data from Companies House, including accounts, confirmation statements, and resolutions.
- Officers & PSC — directors, secretaries, shareholders, and persons of significant control with appointment histories.
- Due Diligence & Risk — automated risk assessments with red flags, compliance checks, and detailed reports.
- Market Analytics — industry breakdowns, geographic insights, and sector benchmarking across the UK.
Frequently Asked Questions
- What is CompanyStack?
- CompanyStack is a UK Company Intelligence API that provides enriched data on over 5.7 million UK-registered companies. It offers health scores, due diligence reports, filing history, officer and PSC data, and market analytics — all accessible via a fast REST API.
- How many UK companies are in CompanyStack?
- CompanyStack contains data on over 5.7 million UK-registered companies, sourced from Companies House and enriched with health scores, risk analysis, and market intelligence.
- Is the Companies House data free?
- CompanyStack offers a free tier with 100 API requests per day, including company search, basic profiles, and health scores. Paid plans starting at £29/month unlock higher rate limits, filing history, officers, PSC data, and due diligence reports.
- What data does CompanyStack provide?
- CompanyStack provides company profiles, health scores (0–100 with letter grades), filing history, officer and director data, persons of significant control (PSC), charges, due diligence reports, risk assessments, and market analytics including industry and geographic breakdowns.
- How often is the data updated?
- CompanyStack syncs data in real-time from Companies House. New filings, officer changes, and status updates are reflected as soon as they are published by Companies House, ensuring you always have the most current information.