Companies House Bulk Data Extraction: A Complete UK Guide for 2026

Introduction

Companies House is the most accessible corporate registry in the world — and one of the most underutilised. The free APIs and bulk downloads cover 5.1M+ UK companies, every director appointment, every filing, and the entire PSC (People with Significant Control) register. For UK legal tech, KYC, credit, compliance, and corporate intelligence firms, knowing how to extract and enrich this data at scale is foundational.

What Companies House Actually Provides

Three primary access methods: (1) the Companies House Public Data API for live querying, with rate limits but free for personal use; (2) bulk product downloads — full company snapshot files updated daily/monthly; (3) the filings feed — a chronological stream of every filing made each day. Combined, these provide near-real-time UK corporate transparency.

Why Bulk Data Alone Isn't Enough

Raw Companies House data is comprehensive but unrefined. To build a real intelligence layer, you need: director entity resolution (same person across multiple companies under name variants); PSC chain resolution (true beneficial owners through multi-layer corporate structures); event classification (which filings indicate strike-off risk vs routine compliance); and connection to external signals (FCA register, news mentions, court filings).

The Architecture for Production-Grade Pipelines

1. Baseline Ingestion via Bulk Products

Daily download of the basic company data snapshot and monthly download of full filing histories. Stored in PostgreSQL with appropriate indexing for fast lookup by company number, director name, address, and PSC details.

2. Real-Time Filing Stream

The filings feed provides near-real-time event detection — director appointments within minutes of filing, charges within hours of registration. Critical for KYC, credit, and compliance use cases where staleness matters.

3. Entity Resolution Layer

Same individual often appears as 'John Smith', 'J Smith', 'John A Smith' across different companies. Production entity resolution combines name normalisation, DOB matching (Companies House publishes month/year), and address proximity. Achieves 96%+ precision.

4. PSC Chain Resolution

PSC data tells you the immediate controlling party but often that's another company. Recursive chain traversal — up to 8-10 levels deep — surfaces the ultimate beneficial owner through corporate structures.

5. Event Classification

Filings come in 50+ types. ML classification auto-tags filings by business impact: director change, charge filed, accounts overdue, strike-off proposed, dissolution complete. Enables clean event streams for downstream consumers.

Common Use Cases for UK Firms

• KYC platforms verifying corporate clients
• Lenders assessing SMB credit risk
• Compliance teams monitoring counterparty changes
• Legal tech automating company research
• Investigative journalism tracing beneficial ownership
• Sales teams building prospect lists with corporate signals

Working with Companies House Within Rate Limits

The Companies House API has rate limits (600 requests per 5-minute window for standard accounts). Production pipelines must combine bulk downloads (no rate limit) for baseline data with surgical API calls for real-time event verification. Naive 'scrape every company' approaches hit rate limits within hours.

UK GDPR Considerations

Companies House data is published under specific UK statutory authority — meaning the data subjects (directors, PSCs) have reduced reasonable expectations of privacy regarding their corporate role. However, their data is still personal data under UK GDPR, and aggregating Companies House data with external sources can trigger broader compliance requirements.

Frequently Asked Questions

1. Is Companies House data free to use commercially?

Yes. Companies House data is Open Government Licence (OGL) compatible, free for commercial reuse with attribution.

2. How current is bulk data?

Basic company snapshots are daily; full filing histories are monthly. For real-time intelligence, supplement bulk data with the filings feed.

3. Can we link Companies House data to news and court records?

Yes — sophisticated pipelines link Companies House records to BAILII court records, ICO enforcement actions, FCA filings, and news mentions for comprehensive corporate intelligence.