- John Frederick Ltd - London
- John Groves Ticket Systems Ltd - London
- John Rigby & Co Gunmakers Ltd - London
- John Rowan & Partners - London
- Jolly IT Solutions Ltd - London
- Jon Adam - London
- Jongerius International Ltd - London
- Joopio - London
- Jori White Public Relations - London
- Joseph & Pearce Ltd - London
- Joseph Alan Ltd - London
- Joshua Altback Hair & Beauty - London
- Joubere - London
- JR Cadman Ltd - London
- JRI Limited - London
- JS Fun Event Hire - London
- JSB - London
- JSS Search - London
- Julian Hurst Interiors - London
- Julie's Bicycle - London
- Junk Please - London
- Junk Removal London - London
- Juno Glass - London
- Jury & King: Waste Clearances - London
- Just Brothers - London
- Just Christmas Parties - London
- Just Clear - London
- Justis Publishing Ltd - London
- K - M E D - London
- K A Services UK Ltd - London
- K Com - London
- K G Fabrications - London
- K J Joinery - London
- K&B Accountancy Group - London
- K9 Security Ltd. - London
- KA Services (UK) Limited - London
- Kade Media Ltd - London
- Kair Ventilation Ltd - London - London
- Kaizen Furniture Makers Ltd. - London
- Kaloric Heater Co. Ltd - London
- Kandor Modelmakers - London
- Kaomi Marketing UK - London
- KASERP - London
- KashFlow Software Ltd - London
- Kashket & Partners - London
- Kaushalam - London
- Kavco - London
- Kay Electrical & Security Ltd - London
- Kaymet Ltd - London
- Kazem Hair - London
Companies 2051 to 2100
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