- J H Porter & Son Ltd - London
- J J Net - London
- J K Clothing - London
- J K London - London
- J Muir Bookbinding Ltd - London
- J S H Security Marketing UK Ltd - London
- J V C Kenwood Ltd - London
- J&J Security Ltd - London
- J.A Coles(Removal Contractors) Ltd - London
- J3 Advisory - London
- Jacaranda Productions Ltd - London
- Jack Ndel - London
- Jacksons Art Supplies Ltd - London
- Jacob & Jacob Heating & Electrical - london
- Jacob Bailey Advertising - London
- JAKS - London
- James Gilbert and Son - London
- James Hoyle & Son - London
- James Ince & Sons (Umbrellas) Ltd - London
- James Smith & SonS - London
- James Taylor & Son - London
- Jampel Davison & Bell - London
- Jane Iredale - London
- Janitorial Express - London
- Janitorial Supplies - London
- Jantex Construction Ltd - London
- Janus Publishing - London
- JAQ Printer - London
- Jardine Lloyd Thompson Group plc - London
- JAS Works Ltd - London
- Jayex Healthcare - London
- JDI Builders Ltd - London
- Jens Moeller Consulting Ltd - London
- Jeremy Gardner Associates - London
- Jermyn Street Design - London
- Jessica Kingsley Publishers - London
- Jet Virtual - London
- Jewellery Display Co, The - London
- JGP Resourcing Ltd - London
- jiggsoft - London
- Jigsaw Research Ltd - London
- Jigsaw Security Solutions Ltd - London
- JJR Construction Services Ltd - London
- JK London Nail & Beauty Supplies - London
- JKWS - London
- JNR Limited - Fire Protection London - London
- John Cullen - London
- John Cullen Lighting - London
- John D Wood - London
- John Desmond Ltd - London
Companies 2001 to 2050
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