| Jaydee Professional Limited | Health & social care | 2019 |
| Jayimpact Associates Ltd | Real estate | 2026 |
| Jayimpact Group Ltd | Construction | 2024 |
| Jaymell Ltd | Wholesale & retail | 2021 |
| Jays Fireworks Ltd | Arts & recreation | 2020 |
| Jays Plumbing Limited | Construction | 2024 |
| Jaytad Private Limited | Health & social care | 2013 |
| JB Exterior Ltd | Administrative & support | 2024 |
| JB Homes (London) Ltd | Construction | 2020 |
| JB Languages Recruitment Limited | Administrative & support | 2023 |
| JB Partners Financial Services Limited | Financial services | 2025 |
| JB Partners Holdings Limited | Financial services | 2025 |
| JB Rees Limited | Information & communication | 2025 |
| Jbnh Holdings Limited | Real estate | 2022 |
| JBS Fire Ltd | Construction | 2025 |
| JC Energy Ltd | Construction | 2017 |
| JCK Services 1 Ltd | Construction | 2021 |
| JD Asset Investment Limited | Real estate | 2019 |
| JD Enterprises Property Co Limited | Real estate | 2025 |
| JD Grove Road Ltd | Real estate | 2019 |
| JD Investment Group Limited | Financial services | 2021 |
| JD Logistic Ltd | Transport & logistics | 2025 |
| JD Solutions Group Ltd | Administrative & support | 2020 |
| JD Trade Ltd | Real estate | 2022 |
| Jdac Investments Limited | Real estate | 2019 |
| JDC Services (UK) Ltd | Manufacturing | 2006 |
| JDH Electrical Ltd | Construction | 2021 |
| JDL Drylining Ltd | Construction | 2011 |
| Jedlake Limited | Administrative & support | 2001 |
| Jeevan Transport Limited | Transport & logistics | 2007 |
| Jekaconnect Ltd | Information & communication | 2026 |
| Jelosimi Art Center Ltd | Wholesale & retail | 2023 |
| Jen-Mol Optical Ltd | Health & social care | 2016 |
| Jenny Jayden Construction Ltd | Construction | 2020 |
| Jenny Jayden Properties Ltd | Real estate | 2016 |
| Jenny Jayden Trading Ltd | Wholesale & retail | 2020 |
| JES Dilov Ltd | Construction | 2015 |
| Jesjo Ltd | Hospitality | 2017 |
| Jessamine House Ltd | Hospitality | 2019 |
| Jessicas Cake Company Ltd | Hospitality | 2019 |
| JET Electrical Solutions Ltd | Other services | 2022 |
| JET Global Management Ltd | Professional & scientific | 2025 |
| Jetpace Ltd | Transport & logistics | 2014 |
| Jette Holdings Ltd | Manufacturing | 2025 |
| Jewels Tours Ltd | Transport & logistics | 2005 |
| JEY Marketing Solutions Limited | Administrative & support | 2016 |
| JG Eateries Ltd | Wholesale & retail | 2024 |
| JG Foodie Ltd | Hospitality | 2018 |
| JGB Roofing Services Ltd | Construction | 2023 |
| Jgroup Asset Hold Ltd | Construction | 2015 |
| JH Management Ltd | Construction | 2022 |
| Jhangra Properties Limited | Transport & logistics | 2022 |
| Jhony G Trans Ltd | Transport & logistics | 2025 |
| Jhumra Clothing Ltd | Wholesale & retail | 2025 |
| JI IT Solutions Ltd | Information & communication | 2026 |
| Jiji Ventures Limited | Transport & logistics | 2020 |
| Jimby Ltd | Wholesale & retail | 2025 |
| Jinziex Limited | Hospitality | 2024 |
| Jireh's Playhouse Limited | Hospitality | 2024 |
| JJ Builders & Contractors Ltd | Construction | 2018 |
| JJL Contracts Ltd | Construction | 2018 |
| JJL Services (Kent) Ltd | Other services | 2018 |
| Jjs.Singh.Commercial Ltd | Manufacturing | 2014 |
| JK Building & Decorating Services Ltd | Construction | 2018 |
| JK Carbon Ltd | Wholesale & retail | 2023 |
| JK Construction and Property Management Kent Limited | Real estate | 2020 |
| JK Couriers Ltd | Transport & logistics | 2004 |
| JK Rentals (Kent) Limited | Administrative & support | 2013 |
| Jkrr Property Limited | Real estate | 2025 |
| JL Endeavour Ltd | Professional & scientific | 2021 |
| JL Star Ltd | Construction | 2023 |
| JLA Hair Limited | Other services | 2017 |
| Jlck Limited | Financial services | 2024 |
| JLM Heat Source Ltd | Construction | 2026 |
| JLO Beauty and Aesthetics Limited | Other services | 2026 |
| JLO Consultancy Ltd | Other services | 2018 |
| JLT Professional T/A Frills & FUN Ltd | Professional & scientific | 2022 |
| JM Dryliner Limited | Construction | 2014 |
| JM Godiva Ltd. | Construction | 2012 |
| JM Home & Building Improvements Limited | Construction | 2021 |
| JM Nails & Spa Ltd | Other services | 2019 |
| JM Nursery Co Limited | Financial services | 2023 |
| JM Property Estate Ltd | Real estate | 2022 |
| JM Resico Limited | Real estate | 2023 |
| JME Finishing Enterprise Limited | Other services | 2016 |
| JMF Roofing Limited | Construction | 2024 |
| Jmgd Associates Ltd | Health & social care | 2024 |
| JMM Design Ltd | Professional & scientific | 2023 |
| JMP Aggregates Ltd | Mining & quarrying | 2021 |
| JMP Surfacing Limited | Construction | 2015 |
| JMS Bridge Ltd. | Wholesale & retail | 2002 |
| JMS Civil Engineering Ltd | Professional & scientific | 2005 |
| JMV Cars Ltd | Wholesale & retail | 2020 |
| JN Invest Ltd | Financial services | 2025 |
| JN Jones Limited | Construction | 2017 |
| JNB Freight Logistic Limited | Transport & logistics | 2024 |
| Joanna’S Retail Ltd | Wholesale & retail | 2023 |
| Joannes Biyi Ventures Limited | Transport & logistics | 2013 |
| JOB Central Ltd | Administrative & support | 2024 |
| Jobitex Ltd | Information & communication | 2024 |