Company Ownership Search API

The Company Ownership Search API provides access to the UK's Commercial and Corporate Ownership Dataset, containing over 4.3 million property ownership records. This dataset tracks properties owned by companies, LLPs, and other corporate entities across England and Wales.

This API provides access to:

• Company name and registration number searches
• Property address lookups
• Land Registry title number searches
• Corporate property ownership data
• Purchase prices and transaction details
• Proprietor addresses and company details

Key Features:

• Comprehensive Search: Search by company name, registration number, property address, or title number
• Detailed Records: Full property and ownership information including prices paid
• Real-time Data: Access to the latest available commercial ownership data
• Flexible Pagination: Control result set size and pagination
• Credit-based Billing: Pay only for successful searches that return results

All requests to the Company Ownership Search API require authentication using an API key. You can obtain your API key from your PropertyInsights dashboard after subscribing to an API plan.

Include your API key in the request header as follows:

X-API-Key: your_api_key_here

Base URL

https://propertyinsights.co.uk/api/v1/company-ownership/search

Successful chargeable JSON responses include a top-level billing object. The endpoint examples on this page focus on the endpoint-specific data, so this repeated block may not be shown in every example.

"billing": {
  "mode": "prepaid",
  "creditsCharged": 1,
  "creditsRemaining": 1999,
  "creditsRefreshAt": "2026-08-14T09:30:00.000Z"
}

All authenticated API-key calls expose the billing headers, including validation errors and zero-credit status or management requests. Only successful chargeable JSON responses add the billing object to the response body.

All API responses follow this structure:

{
  "success": true,
  "data": {
    "results": [
      {
        "id": "12345",
        "title_number": "AB123456",
        "tenure": "Freehold",
        "property_address": "123 EXAMPLE STREET, LONDON",
        "district": "LONDON BOROUGH OF EXAMPLE",
        "county": "GREATER LONDON",
        "region": "LONDON",
        "postcode": "SW1A 1AA",
        "multiple_address_indicator": "N",
        "price_paid": 1500000,
        "proprietor_name": "EXAMPLE PROPERTY LTD",
        "company_registration_number": "12345678",
        "proprietorship_category": "Limited Company or Public Limited Company",
        "country_incorporated": "UNITED KINGDOM",
        "proprietor_address": "456 BUSINESS PARK, LONDON SW1A 1BB"
      }
    ],
    "search": {
      "term": "EXAMPLE PROPERTY",
      "type": "company_name",
      "results_count": 1,
      "max_results": 50
    }
  }
}

Search by Title Number

curl -X GET "https://propertyinsights.co.uk/api/v1/company-ownership/search?term=AB123456&type=title_number" \
  -H "x-api-key: your-api-key-here"

The API uses standard HTTP response codes and returns detailed error information in JSON format. All errors follow a consistent structure to help you handle them appropriately in your application.

Error Response Format

{
  "success": false,
  "error": {
    "code": "SEARCH_TERM_TOO_SHORT",
    "message": "Name and address searches require at least 4 characters."
  }
}

API requests are subject to rate limiting based on your subscription plan. The current limits are:

When you exceed your rate limit, the API will return a 429 Too Many Requests response. Each response includes the following headers to help you track your usage:

X-RateLimit-Limit: [requests-per-minute limit]
X-RateLimit-Remaining: [requests remaining in current window]
X-RateLimit-Reset: [timestamp when limit resets]