UK Company Intelligence,
Built for Developers
CompanyStack provides instant access to comprehensive UK company data through a modern, developer-first API. We aggregate Companies House bulk data, PSC registers, and live filings into a single, fast, intelligent platform.
Our Mission
The Companies House API is powerful but limited — restrictive rate limits, no bulk access, and no intelligence layer. CompanyStack solves this by maintaining a complete, enriched database of every UK company, updated daily.
We believe company data should be fast, affordable, and intelligent. Whether you're building a fintech KYC flow, a B2B prospecting tool, or regulatory compliance software — you shouldn't have to worry about rate limits or stale data.
What We Offer
- Full-text & autocomplete search across 5.7M+ companies
- AI-powered health scores and risk intelligence
- 15.4M+ Persons of Significant Control records
- Industry & geographic analytics by SIC code & postcode
- Real-time proxy to Companies House for live filings
- Corporate group mapping & director network analysis
- Enterprise due diligence reports
- Watchlist monitoring with change alerts
CompanyStack by the Numbers
Built with Modern Technology
PostgreSQL
Full-text search with tsvector, trigram similarity, and optimized indexes across 5.7M+ rows.
Hono Framework
Ultrafast Node.js API with middleware for auth, rate limiting, caching, and CORS.
Svelte 5
Latest Svelte with runes ($state, $derived) for a blazing-fast reactive portal.
Companies House
Real-time proxy integration for live officer, filing, PSC, and charge data.
In-Memory Cache
Analytics and frequently-accessed data cached with automatic TTL refresh.
Daily Updates
Automated differential updates from Companies House bulk data products.
Built by BlackPeak CFO
CompanyStack is a product of BlackPeak CFO Ltd, a London-based technology company focused on financial intelligence and data infrastructure. We build tools that make business data accessible and actionable.