| JB Isolation Solutions Limited | Professional & scientific | 2016 |
| JB Prestige Cars Ltd | Wholesale & retail | 2020 |
| JB Technicals Ltd | Administrative & support | 2023 |
| JB1 Innovation Ltd | Professional & scientific | 2021 |
| JBC Digital Ltd | Extraterritorial | 2013 |
| JBC LAB Limited | Administrative & support | 2016 |
| JBD Express Ltd | Transport & logistics | 2023 |
| JBE Developments Limited | Construction | 2019 |
| JBE Group Limited | Professional & scientific | 2019 |
| JBE Interiors Ltd | Construction | 2017 |
| JBG Planning Solutions Limited | Transport & logistics | 2021 |
| JBH Quantity Surveying Limited | Administrative & support | 2019 |
| Jbkl Enterprises Ltd | Administrative & support | 2026 |
| JBL Trans Ltd | Transport & logistics | 2015 |
| JBM TM Ltd | Public administration | 2024 |
| JBS Timber Limited | Agriculture & fishing | 2018 |
| Jbta Ltd | Wholesale & retail | 2024 |
| JBV Data Ltd | Information & communication | 2025 |
| JBW Business Solutions Ltd | Professional & scientific | 2024 |
| JBW Mechanical Ltd | Construction | 2020 |
| JC & AC Electrical Ltd | Manufacturing | 2017 |
| JC - Czech Ltd | Financial services | 2018 |
| JC Creations Ltd | Wholesale & retail | 2026 |
| JC Dungworth Ltd | Wholesale & retail | 2022 |
| JC Interiors(Grantham) Ltd | Other services | 2020 |
| JC Whitfield Limited | Construction | 2015 |
| JCG Solutions Ltd | Professional & scientific | 2024 |
| JCH Engineering Services Ltd | Professional & scientific | 2024 |
| JCJ Minerals Ltd | Mining & quarrying | 2019 |
| JCM Building and Fencing Ltd | Construction | 2018 |
| JCM Rail Ltd | Construction | 2025 |
| Jcmusicals Limited | Extraterritorial | 2024 |
| JCN Media Ltd | Information & communication | 2018 |
| JCP Construction Ltd | Construction | 2018 |
| Jcrs Solutions Limited | Construction | 2019 |
| JCS Roofing Services Ltd | Construction | 2021 |
| JCW Roofing Ltd | Construction | 2024 |
| JD Direct Solutions Limited | Information & communication | 2007 |
| JD Mechengineering Ltd | Professional & scientific | 2022 |
| JD Veterinary Services Limited | Professional & scientific | 2017 |
| JD Young Property Ltd | Real estate | 2019 |
| Jd&Mj Properties Ltd | Real estate | 2025 |
| JDA - Invest Ltd | Extraterritorial | 2018 |
| JDB Plant Services Limited | Wholesale & retail | 2020 |
| Jdbk Ltd | Real estate | 2026 |
| Jdbrooks Holdings Ltd | Financial services | 2023 |
| JDL Medical and Financial Limited | Financial services | 2018 |
| JDL Wealth Management Limited | Financial services | 2018 |
| JDM PT Ltd | Arts & recreation | 2024 |
| Jdrc Rollingstock Ltd | Manufacturing | 2026 |
| JDS Lofts Ltd | Construction | 2021 |
| JE Rendering Specialist Ltd | Construction | 2021 |
| Jean Pierre Digital Intelligence Ltd | Information & communication | 2025 |
| Jeanies Ltd | Other services | 2026 |
| JEB Consultants Limited | Administrative & support | 2016 |
| Jebb Properties Limited | Real estate | 2014 |
| JEC Contractors Ltd | Construction | 2018 |
| Jedker Limited | Transport & logistics | 2019 |
| JEH Consulting Limited | Professional & scientific | 2009 |
| Jelly and Fizz Ltd | Wholesale & retail | 2025 |
| Jelly and Fizz Stores Ltd | Wholesale & retail | 2026 |
| Jellyjelibon Limited | Transport & logistics | 2018 |
| JEM Automotive Developments Ltd | Wholesale & retail | 2012 |
| JEM Management & Business Solutions Ltd | Professional & scientific | 2022 |
| JEM Property & Estate Management Ltd | Construction | 2025 |
| Jem's Developments Ltd | Construction | 2024 |
| Jembo IT Services & Consultancy Ltd | Information & communication | 2020 |
| JEMMS27 Limited | Professional & scientific | 2018 |
| Jenysuciudan Logistics Ltd | Transport & logistics | 2025 |
| JEO Property Limited | Real estate | 2025 |
| Jeremy Cooper Ltd | Professional & scientific | 2013 |
| Jeremy Fletcher Words Limited | Arts & recreation | 2025 |
| Jeros (UK) Limited | Wholesale & retail | 2017 |
| Jerram Building Services Ltd | Construction | 2022 |
| Jeruck Limited | Real estate | 2024 |
| JES Media Ltd | Wholesale & retail | 2019 |
| Jess Stow Ltd | Arts & recreation | 2021 |
| Jesscam Consulting Limited | Professional & scientific | 2008 |
| Jesse Smart Limited | Health & social care | 2023 |
| Jessica Berry Limited | Arts & recreation | 2014 |
| Jessica Grimes Estates Ltd | Real estate | 2023 |
| Jessieatransport Ltd | Transport & logistics | 2025 |
| Jest Limited | Information & communication | 1997 |
| Jesus Family Pentecostal Ministry CIC | Administrative & support | 2024 |
| JET Simulator Limited | Arts & recreation | 2016 |
| JET Social Club Ltd | Hospitality | 2016 |
| Jetguruuk Ltd | Manufacturing | 2025 |
| Jetstream Finance Limited | Financial services | 2025 |
| Jewel Infrastructure Limited | Wholesale & retail | 2021 |
| Jewel Tiling (Group) Ltd | Construction | 2009 |
| Jewels by J Ltd | Wholesale & retail | 2025 |
| JF Bodman Ltd | Construction | 2011 |
| JF Future Limited | Other services | 2025 |
| Jfdn Medics Limited | Health & social care | 2022 |
| Jfwelding Ltd | Manufacturing | 2026 |
| JG Doncaster Limited | Hospitality | 2023 |
| JG Elite Aesthetics Limited | Other services | 2025 |
| JG Management Services Ltd | Transport & logistics | 2025 |
| JG Pro Ltd | Transport & logistics | 2015 |
| JG Transport Services Ltd | Transport & logistics | 2020 |