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Companies House · London

UK companies in London

London holds more UK companies than anywhere else. About 1 in 4 active UK ltds is registered to a London postcode. Professional services lead the mix: legal, accountancy and consultancy. Finance and tech come next. E-commerce and media clusters are growing fast. Many London registrations are holding companies that really trade somewhere else. Leadistry shows you both addresses.

At a glance

Key facts

  • London holds about 25% of all active UK ltd companies
  • Central London (EC + WC postcodes) is mostly professional services and finance. SIC 70229 alone covers over 80,000 registered companies
  • More companies are set up in London each month than in any other city, usually 10,000+ new ltds a month
Measured

The most registered SIC codes in London

Counting active companies whose registered office is a London post town, these are the codes that come up most often on the August 2026 Companies House snapshot. Other letting and operating of own or leased real estate leads with 88,571 companies. It is worth reading against the sectors above: the authored view is what London is known for, this is what its companies actually filed.

A company may register up to four SIC codes and these counts include every position, so a business filed under two of them appears twice. Use the list to pick a code, then narrow by postcode and incorporation date. Every company you pull carries the Companies House record, the director's name, a verified website and a verified email, and the ones we cannot complete are not charged.

Where the volume sits

Dominant sectors in London

SIC 70229, Management consultancyView SIC 70229 →
The biggest sector in central London postcodes
SIC 62012, Business and domestic software developmentView SIC 62012 →
SIC 69201, Accounting, auditing, and tax consultancyView SIC 69201 →
SIC 68320, Real estate management on a fee basisView SIC 68320 →
SIC 73110, Advertising agenciesView SIC 73110 →
Search recipe

Postcode filter

To target London on Leadistry, set the postcode prefix filter to:

EC, WC, E, N, NW, SE, SW, W, BR, CR, DA, EN, HA, IG, KT, RM, SM, TW, UB

The search returns companies with a registered office in any of these postcode areas. Add a SIC code filter from the table above to narrow by sector.

Answers

About London on Companies House

How many active UK companies are registered in London?

About 1.2 million. That is roughly a quarter of the UK total. Leadistry indexes every one of them. The data refreshes daily from the Companies House register.

Can I filter to specific London boroughs or postcodes?

Yes. Pick any set of postcode prefixes you like. Use EC for the City, E1–E20 for East London, or SW for South West London. Add a SIC code to get a sector list inside one borough.

Many London-registered companies do not trade in London. Does that hurt lead quality?

It can. A ltd registered in London may really trade in Manchester. Leadistry shows the registered office and any later change-of-address filings. You can spot the mismatch before you send anything.

Other UK cities: Manchester · Birmingham · Leeds · Bristol · Glasgow · Edinburgh · Liverpool · Newcastle upon Tyne · Sheffield

Companies House · London

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