| JCM Tennis Limited | Arts & recreation | 2019 |
| Jcmotors Garage Ltd | Wholesale & retail | 2024 |
| JCR Property Ltd | Real estate | 2025 |
| JCS Building Ltd | Construction | 2025 |
| JCS Contractors Ltd | Construction | 2024 |
| JCT Home Care Consulting Ltd | Health & social care | 2023 |
| Jctl Ltd | Information & communication | 2019 |
| Jcuts Ltd | Other services | 2025 |
| JCV Ceilings & Partitions Limited | Construction | 2022 |
| JCZ Security Services Limited | Hospitality | 2025 |
| Jc’S Kitchenz Ltd | Hospitality | 2023 |
| JD Alpha Services Limited | Mining & quarrying | 2013 |
| JD Construction & Landscaping Limited | Construction | 2018 |
| JD Electrical Projects Limited | Other services | 2017 |
| JD Gadhvi Properties Ltd | Real estate | 2019 |
| JD Insulations Ltd | Construction | 2008 |
| JD Joinery Solutions Ltd | Construction | 2025 |
| JD Randall Ltd. | Health & social care | 2015 |
| JD Surgical Limited | Wholesale & retail | 2015 |
| Jdaj Global Resources Ltd | Financial services | 2025 |
| JDB Brickwork Ltd | Construction | 2017 |
| JDB Commercials Ltd | Wholesale & retail | 2020 |
| Jdbingley Limited | Information & communication | 2019 |
| JDD Brickwork Ltd | Construction | 2025 |
| JDM Cars Direct Limited | Wholesale & retail | 2021 |
| JDM Demolition Limited | Construction | 2026 |
| JDP Frames Limited | Manufacturing | 2000 |
| Jdpubsolutions Limited | Hospitality | 2019 |
| JDQ Property Maintenance Services Ltd | Construction | 2017 |
| JDR Investments Limited | Real estate | 2018 |
| Jdrs Properties Limited | Real estate | 2023 |
| JDS Coaching Ltd | Education | 2015 |
| JDT10 Ltd | Arts & recreation | 2025 |
| JDT10 Mgmt Ltd | Professional & scientific | 2025 |
| Jdudevelopments Ltd | Construction | 2019 |
| JDW Electrical Specialists Limited | Construction | 2023 |
| Jdws Developments Ltd | Real estate | 2024 |
| Jdy's Consultancy Ltd | Other services | 2024 |
| Jdy's Relocation Company Ltd | Hospitality | 2023 |
| JE Group Services Ltd | Manufacturing | 2019 |
| JE Ladybird Limited | Hospitality | 2024 |
| JE Travels Limited | Administrative & support | 2025 |
| Jeachris Limited | Transport & logistics | 2024 |
| Jean Dorothy Bailey Ltd | Extraterritorial | 2023 |
| Jeanifer Limited | Health & social care | 2024 |
| Jeanne of Oadby Ltd | Wholesale & retail | 2009 |
| JEC Ventures Limited | Arts & recreation | 2025 |
| Jeco Testing Ltd | Construction | 2023 |
| Jeebra Technologies Limited | Information & communication | 2024 |
| Jeelo Care Solutions Ltd | Health & social care | 2025 |
| Jeet AD Limited | Professional & scientific | 2009 |
| Jeet Builders Ltd | Construction | 2019 |
| Jeeva 2 Limited | Real estate | 2025 |
| Jeeva Brothers 2 Limited | Real estate | 2019 |
| Jeevan Maan Limited | Arts & recreation | 2023 |
| Jeevan Travel Ltd | Other services | 2019 |
| Jeevat Transport Limited | Transport & logistics | 2022 |
| Jeff Scoffham Architects Limited | Professional & scientific | 2021 |
| Jeffrey's Health Care Solutions Ltd | Health & social care | 2024 |
| Jehan Properties Ltd | Real estate | 2021 |
| Jella Limited | Information & communication | 2004 |
| Jelly Rolls Limited | Wholesale & retail | 1998 |
| Jelly Vine Productions Ltd | Information & communication | 2005 |
| Jellyfish Apps Ltd | Information & communication | 2015 |
| Jelps Ltd | Administrative & support | 2022 |
| Jelson Lowes Ltd | Wholesale & retail | 2025 |
| JEM Network Services Ltd | Other services | 2017 |
| Jemmorley Construction Ltd | Construction | 2019 |
| Jems by Jemima Onuwe Ltd | Other services | 2025 |
| Jemy Ltd | Manufacturing | 2019 |
| JEN Optics Ltd | Health & social care | 2022 |
| Jendav Holdings Ltd | Real estate | 2025 |
| Jeneva Limited | Construction | 2014 |
| Jeneva SPV Ltd | Real estate | 2021 |
| Jenko Aviation Limited | Transport & logistics | 2003 |
| Jennifer Hamilton & Associates Ltd | Real estate | 2003 |
| Jennifer Ratcliff Creative Studio Ltd | Professional & scientific | 2021 |
| Jennifer Sandelson Limited | Administrative & support | 2004 |
| Jennifer’S Services Ltd | Administrative & support | 2026 |
| Jennison Andrew Ltd | Wholesale & retail | 2025 |
| Jenno's Coffee House Limited | Hospitality | 2012 |
| Jenny James Ltd | Hospitality | 2018 |
| Jensen Group Limited | Professional & scientific | 2016 |
| Jensenlet Limited | Hospitality | 2018 |
| Jensenlet Property LLP | | 2018 |
| Jenson Hollis Ltd | Wholesale & retail | 2025 |
| Jenton Solutions Limited | Wholesale & retail | 2009 |
| Jeny Electronics Ltd | Wholesale & retail | 2025 |
| Jenzsquared Ltd | Information & communication | 2025 |
| Jeram Superstore Limited | Wholesale & retail | 2011 |
| Jeremy Tomlinson Limited | Professional & scientific | 2012 |
| Jerita Group Ltd | Administrative & support | 2014 |
| Jerome Price Music Ltd | Information & communication | 2017 |
| Jerrico Limited | Health & social care | 2012 |
| JES Plumbing & Heating Limited | Construction | 2009 |
| Jesda Educational Consultancy Limited | Information & communication | 2022 |
| Jesda TV Limited | Information & communication | 2025 |
| Jessem Limited | Information & communication | 2015 |
| Jessop Kariolis Holdings Limited | Professional & scientific | 2017 |
| Jessop Kariolis Limited | Information & communication | 2007 |