| Jmgt Asset Management Ltd | Other services | 2018 |
| JMH Cyber Limited | Information & communication | 2022 |
| JMH Motors Ltd | Wholesale & retail | 2017 |
| JMJ Surveyors Limited | Administrative & support | 2020 |
| Jmjm Trading Ltd | Wholesale & retail | 2025 |
| JML Bullion Ltd | Wholesale & retail | 2025 |
| JML Property Services Ltd | Real estate | 2019 |
| Jmlhsby Trading Ltd | Wholesale & retail | 2025 |
| JMM Universal Corporation Limited | Financial services | 2019 |
| JMM Universal Technologies Limited | Information & communication | 2019 |
| JMN Telecoms Limited | Information & communication | 2017 |
| Jmo.Tv Limited | Information & communication | 2006 |
| JMP & NWD Park Homes Ltd | Transport & logistics | 2025 |
| JMP Just Haulage Ltd | Transport & logistics | 2024 |
| JMP Park Home Sales Ltd | Transport & logistics | 2026 |
| JMP UK Holdings Ltd | Transport & logistics | 2025 |
| Jmpa Holdings Limited | Real estate | 2022 |
| Jmpemhealthcare Limited | Health & social care | 2014 |
| JMS MD Ltd | Health & social care | 2021 |
| JMS Plant Personnel Ltd | Professional & scientific | 2020 |
| JMS Property Enterprise Limited | Construction | 2020 |
| JMS Traders Ltd | Real estate | 2018 |
| Jms-Uk Ltd | Professional & scientific | 2026 |
| Jmtc Orthodontics Limited | Health & social care | 2025 |
| JMW Group Ltd. | Real estate | 2017 |
| JMW Property Holdings Ltd | Real estate | 2020 |
| JN Events & Promotions Ltd | Arts & recreation | 2019 |
| JN West Limited | Professional & scientific | 2025 |
| JNB Developments Ltd | Construction | 2024 |
| JNG Media Ltd. | Information & communication | 2013 |
| JNJ Developments Ltd | Construction | 2024 |
| JNJ Holdings Limited | Real estate | 2015 |
| JNJ Leisure Ltd | Other services | 2010 |
| JNJ Project & Financial Controls Services Limited | Construction | 2018 |
| JNL Carpentry and Construction Ltd | Manufacturing | 2023 |
| JNP Corporations Ltd | Wholesale & retail | 2019 |
| JNR Cardiff Ltd | Financial services | 2022 |
| JNR D&B Holdco Ltd | Financial services | 2025 |
| JNR D&B Limited | Construction | 2025 |
| JNR Developers Limited | Construction | 2016 |
| JNR DT Limited | Financial services | 2025 |
| JNR Financial Consultancy Limited | Financial services | 2024 |
| JNR London Limited | Financial services | 2025 |
| JNR Partners Limited | Real estate | 2024 |
| JNR Properties Holdings Ltd | Financial services | 2024 |
| JNR Property Development Limited | Real estate | 2015 |
| JNR Property Management Limited | Real estate | 2013 |
| JNS Home Ltd | Construction | 2018 |
| JO & TH Ltd | Other services | 2019 |
| JO Best Services Limited | Wholesale & retail | 2018 |
| JO Wallace Content & Copywriting Ltd | Administrative & support | 2024 |
| Jo's Cafe Cardiff Limited | Hospitality | 2019 |
| Joan Khalaf Limited | Construction | 2014 |
| Joanna Consulting Ltd | Professional & scientific | 2019 |
| Joanna Harmon Limited | Professional & scientific | 2019 |
| Joanne Russell Trading Ltd | Wholesale & retail | 2025 |
| Joanne Tarr Limited | Information & communication | 2012 |
| Joaotogo Ltd | Wholesale & retail | 2025 |
| Joarlies Farm and Stables (JFS) Ltd | Agriculture & fishing | 2025 |
| Joat International Limited | Professional & scientific | 2008 |
| JOB Doctor Ltd. | Professional & scientific | 2018 |
| JOB Fit Studio Limited | Administrative & support | 2025 |
| JOB Mart Limited | Administrative & support | 2010 |
| JOB Place Limited | Administrative & support | 2009 |
| JOB Solve UK Ltd | Other services | 2025 |
| JOB4U Limited | Administrative & support | 2019 |
| Jobboo & Co Ltd | Wholesale & retail | 2025 |
| Jobforce Services Limited | Construction | 2020 |
| Jobgraph Ltd | Professional & scientific | 2024 |
| Jobling TAR Limited | Construction | 2021 |
| JOBS360 Ltd | Administrative & support | 2017 |
| Jobseekrs Limited | Information & communication | 2017 |
| Jobspott Limited | Information & communication | 2018 |
| Jobspronto Ltd | Administrative & support | 2024 |
| Jobsuk Limited | Administrative & support | 2020 |
| JOC Security Growth Consultancy Ltd. | Financial services | 2014 |
| Jock Jones Ltd | Construction | 2024 |
| JOCKEY39 Ltd | Hospitality | 2025 |
| Jodielee Cann Limited | Wholesale & retail | 2025 |
| Jodielee Cann Trading Limited | Wholesale & retail | 2025 |
| JOE Douglas Services Ltd | Construction | 2019 |
| JOE Rayan Ltd | Wholesale & retail | 2024 |
| Joe's 24 Limited | Health & social care | 2024 |
| Joe-Den Limited | Health & social care | 2013 |
| Joefizz Asset Finance Limited | Administrative & support | 2006 |
| Joefizz Limited | Professional & scientific | 2005 |
| Joel Logistics Ltd | Administrative & support | 2017 |
| Joel Sun Power Ltd. | Financial services | 2024 |
| Joel Williams Limited | Extraterritorial | 2020 |
| Joelwise Logistics Ltd | Transport & logistics | 2025 |
| Joely Ball Home Limited | Manufacturing | 2022 |
| Joel’S Bars Ltd | Hospitality | 2025 |
| Joff COX Ltd | Construction | 2016 |
| Jofuint Limited | Wholesale & retail | 2021 |
| Jogles Limited | Education | 2018 |
| Johal Property Investments Limited | Administrative & support | 2016 |
| Johan Group Limited | Real estate | 2024 |
| Johan Painters and Decors Ltd | Construction | 2024 |
| Johari Group Ltd | Professional & scientific | 2022 |
| John Barclay Media Limited | Professional & scientific | 2021 |