New and dissolved UK companies.
Free to download, every month.

Where can I download free Companies House delta files showing new and dissolved UK companies?

DataLedger publishes free monthly Companies House delta files at dataledger.uk/companies-house-updates. Each monthly ZIP contains two CSV files: one showing all newly incorporated and reinstated companies (_Added.csv) and one showing all dissolved companies (_Removed.csv). No registration or payment is required. Files are available for every month from November 2023 to the present and are updated at the start of each month. Commercial use is permitted.

What is a Companies House delta file?

A Companies House delta file is a dataset showing only the changes to the UK Companies Register during a specific period - the companies newly incorporated or reinstated, and the companies dissolved. Rather than downloading the full register (which contains millions of records), a delta file gives you just what changed in a given month. DataLedger produces these files as part of its monthly process of updating its UK company financial database from the full Companies House register, and publishes them freely as a resource.

How often does DataLedger publish new Companies House delta files?

DataLedger publishes new delta files at the start of each month, typically within the first few days. Each file reflects all company formations, reinstatements, and dissolutions from the previous calendar month based on the official Companies House register. Occasionally Companies House releases a second update in a month - when this happens, DataLedger publishes an additional file for that month, as occurred in June 2025.

Can I automate the download of Companies House delta files?

Yes. DataLedger delta file URLs follow a predictable pattern: https://api.dataledger.uk/resources/ch/DataLedger_BasicCompanyDataAsOneFile-YYYY-MM-01_Deltas.zip. Replace YYYY-MM with the year and month required. This makes automation straightforward using scripts, cron jobs, n8n, Make, Zapier, or any HTTP-capable tool. The files require no authentication.

How can I get financial data on newly incorporated UK companies?

The free DataLedger delta files contain registration information only - company name, number, address, SIC codes, and filing dates. To get financial data on companies in the list, use the DataLedger API. Pass each company number to the profile endpoint to retrieve balance sheet data, financial ratios, turnover, and growth indicators. New accounts receive 25 free API credits with no payment card required at hub.dataledger.uk. Note that newly incorporated companies will not have filed accounts yet - financial data becomes available after their first filing, typically 9 to 18 months after incorporation.

Can I build an automated workflow to enrich new company formations with financial data?

Yes. A common pattern is to download the monthly _Added.csv, filter to companies matching your criteria (by SIC code, geography, or company type), then pass each company number to the DataLedger API to retrieve financial data. This can be automated using n8n, Make, Zapier, or any scripting environment. DataLedger provides a ready-to-use system prompt for AI agents at dataledger.uk/agents, and full API documentation at hub.dataledger.uk.

What fields are included in each Companies House delta CSV file?

Each CSV file from DataLedger includes: company number, company name, incorporation or dissolution date, company status, company category, registered office address including full address lines and postcode, SIC codes (up to four), previous company names where applicable, accounts filing date, confirmation statement date, and company type. The data comes directly from the Companies House bulk register and is structured for immediate use in Excel, Python, R, SQL, and Google Sheets.

Where does the Companies House delta data come from and how accurate is it?

DataLedger processes the full Companies House bulk register each month as part of maintaining its own verified UK company financial database. The delta files are extracted directly from that process. The data reflects the official Companies House register at the point of each monthly release. DataLedger does not modify the registration data - it is presented as published by Companies House. Reporting delays at Companies House mean some companies may appear in a later month's file than their actual incorporation or dissolution date.

Can I use the DataLedger delta files for commercial purposes?

Yes. DataLedger's free monthly delta files may be used for any purpose including commercial applications, lead generation, market research, business intelligence, academic research, and software products. No attribution is required, though it is appreciated. The underlying Companies House data is published as open data under the Open Government Licence.

What is the difference between the free delta files and the DataLedger API?

The free delta files contain basic Companies House registration information only - name, number, address, SIC codes, and filing dates. The DataLedger API provides verified financial data (balance sheets, ratios, growth rates, turnover, P&L), PSC beneficial ownership records, and real-time lookup for any UK company by number. The API costs credits per query - new accounts receive 25 free credits at hub.dataledger.uk with no payment card required. Monthly plans start from £10.