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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

New companies in London

198,723 new companies were set up with a London registered office in the last twelve full months, about 16,560 a month. 14,903 of them were set up in August 2026. That sits on top of 1,009,282 active companies already registered here.

Sept 25: 17,870Oct 25: 18,124Nov 25: 14,502Dec 25: 13,574Jan 26: 18,346Feb 26: 14,640Mar 26: 17,808Apr 26: 17,264May 26: 16,624Jun 26: 16,940Jul 26: 18,128Aug 26: 14,903
Sept 25 to Aug 26. Companies still on the register, counted from the Companies House snapshot.

What the new ones do: Retail sale via mail order houses or via the internet leads, with 18,761 new companies in the year.

  1. 47910Retail sale via mail order houses or via the internet18,761
  2. 62012Business and domestic software development13,495
  3. 70229Other management consultancy activities (not financial)9,806
  4. 68100Buying and selling of own real estate9,063
  5. 68209Other letting and operating of own or leased real estate6,682
For agencies and suppliers

Selling to new London companies

A company in its first months is still choosing who it works with. Reaching it then, with a short email that names what it has just started, is often the easiest time to win them as a client.

  • Marketing agenciesA new company needs a website, a logo and its first customers, usually before it has picked anyone to help.
  • AccountantsEvery new company owes a first set of accounts and a confirmation statement, and many have no accountant yet.
  • IT and software firmsEmail, devices and security get set up in the first months, and the choices made then tend to stick.
  • Insurance brokersEmployers' liability, professional indemnity and van cover are bought early, often in a hurry.
  • RecruitersThe first hires come quickly once a new company wins work.

Leadistry reads the new London registrations every morning, keeps the ones with a working website and a real email, and writes the first email for you to approve. Your first 25 leads are free, as a one-off trial.

Get new London companies as leads

See 3 London companies

Choose who you sell to. These are real companies, shown before you sign up.

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 below: the authored view is what London is known for, this is what its companies actually filed.

  1. 68209Other letting and operating of own or leased real estate88,571
  2. 70229Other management consultancy activities (not financial)71,055
  3. 47910Retail sale via mail order houses or via the internet61,964
  4. 68100Buying and selling of own real estate61,473
  5. 82990Other business support service activities n.e.c.54,097
  6. 62020IT consultancy activities47,425
  7. 62012Business and domestic software development43,080
  8. 96090Other service activities n.e.c.34,997

Pick a code, then narrow by postcode and date. Every company you pull carries a working website and a real email, and we never charge for the ones we cannot complete.

Why do these counts add up to more than the total?

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.

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. New companies are added every morning, and every company's details are read again each month.

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.

Nearby and related cities: Manchester · Birmingham · Leeds · Bristol · Glasgow · Edinburgh · Liverpool · Newcastle upon Tyne · Every UK city

Companies House · London

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