| JIB Consultancy Limited | Information & communication | 2020 |
| Jidanu Trans Ltd | Construction | 2020 |
| JIG Ultracom Ltd | Health & social care | 2023 |
| Jiji's Healthcare Ltd | Health & social care | 2022 |
| Jijie Drylining Limited | Construction | 2025 |
| Jikim Publishing Limited | Information & communication | 2020 |
| Jilani Chicken and Chips Limited | Hospitality | 2019 |
| Jilani Trades Ltd | Wholesale & retail | 2022 |
| Jilbabs Collection Ltd | Wholesale & retail | 2015 |
| Jiman Trading Ltd | Wholesale & retail | 2025 |
| Jimny Jungle Ltd | Wholesale & retail | 2025 |
| Jindal Ltd | Construction | 2023 |
| Jiqson Ltd | Administrative & support | 2019 |
| Jirey Consulting Limited | Professional & scientific | 2013 |
| Jisk Property Ltd | Real estate | 2024 |
| JJ Appliances Ltd | Other services | 2025 |
| JJ Arinena Ltd | Health & social care | 2015 |
| JJ Childminding Ltd | Health & social care | 2024 |
| JJ Construction Group Ltd | Construction | 2016 |
| JJ Ductwork Limited | Manufacturing | 2008 |
| JJ Estate Agents Ltd | Real estate | 2022 |
| JJ Feery Limited | Construction | 2015 |
| JJ Install Limited | Extraterritorial | 2019 |
| JJ Jewels Ltd | Wholesale & retail | 2023 |
| JJ Property and Investment Limited | Real estate | 2026 |
| JJ Property Repairs Ltd | Construction | 2022 |
| JJ Solar & Roofing Ltd | Construction | 2019 |
| JJ Sumi Ltd | Real estate | 2024 |
| JJC Group Holdings Limited | Real estate | 2026 |
| Jjdm Services Ltd | Administrative & support | 2018 |
| JJE Enterprises 2 Limited | Hospitality | 2014 |
| Jjpcommercial Limited | Real estate | 2022 |
| Jjsains Limited | Wholesale & retail | 2020 |
| JK & Smith Private Limited | Hospitality | 2024 |
| JK Accountancy (UK) Limited | Professional & scientific | 2012 |
| JK Capital Limited | Administrative & support | 2025 |
| JK Digital Tech Limited | Information & communication | 2023 |
| JK Dwellings Ltd | Real estate | 2025 |
| JK Electrix Ltd | Construction | 2023 |
| JK Enterprises London Ltd | Administrative & support | 2013 |
| JK Estate Management Limited | Real estate | 2024 |
| JK Fashion Boutique Ltd | Wholesale & retail | 2025 |
| JK Fashion Designer Limited | Wholesale & retail | 2025 |
| JK Food & Drinks Wholesale Ltd | Wholesale & retail | 2024 |
| JK Harmony Ltd | Real estate | 2022 |
| JK House Ltd | Hospitality | 2016 |
| JK Investment Holdings Ltd | Real estate | 2019 |
| JK Parcel Ltd | Transport & logistics | 2021 |
| JK Quantum Limited | Financial services | 2024 |
| JK Tailor Ltd | Other services | 2022 |
| Jk&H Limited | Other services | 2023 |
| JK02 Ltd | Construction | 2025 |
| JK2319 Limited | Transport & logistics | 2025 |
| Jkbmg Limited | Professional & scientific | 2023 |
| JKG Hedge Limited | Households | 2015 |
| JKM Homes Ltd | Real estate | 2022 |
| JKM Restaurants Ltd | Hospitality | 2026 |
| Jkme Ltd | Construction | 2017 |
| Jkns Education Ltd | Education | 2024 |
| JKO Enterprise Ltd | Wholesale & retail | 2025 |
| Jkrd Services Limited | Construction | 2026 |
| Jlkt Solutions Ltd | Information & communication | 2018 |
| JLM Creative Limited | Professional & scientific | 2011 |
| JLN Estate Holdings Limited | Real estate | 2026 |
| JLS Deane Ltd | Construction | 2016 |
| JM Catering Ltd | Hospitality | 2025 |
| JM Isher Ltd | Construction | 2025 |
| JM Security Elite Ltd | Administrative & support | 2025 |
| JM Shopfitter (London) Limited | Construction | 2014 |
| JM Visioncare Ltd | Wholesale & retail | 2024 |
| JM4 Foods Limited | Hospitality | 2021 |
| JM4 Properties Ltd | Real estate | 2018 |
| JM47 Ltd | Construction | 2025 |
| JMA Management Ltd | Real estate | 2025 |
| JMAC123 Ltd | Construction | 2017 |
| Jmakwana Management Services Ltd | Other services | 2017 |
| JMD (London) Limited | Hospitality | 2012 |
| JMD Consults Ltd | Information & communication | 2016 |
| JMD FIX Systems Ltd | Construction | 2017 |
| JMD Refurbishment Ltd | Construction | 2017 |
| JMJ Lettings Ltd | Real estate | 2026 |
| JMJ Partitions Limited | Construction | 2011 |
| JMK Law Limited | Professional & scientific | 2014 |
| JMK Studios Ltd | Professional & scientific | 2022 |
| JML Aesthetics Limited | Other services | 2023 |
| JMS Cyber Limited | Information & communication | 2017 |
| JMS Events Company Ltd | Hospitality | 2025 |
| JMS Homes (UK) Ltd | Real estate | 2014 |
| JMS IT Solutions Ltd | Information & communication | 2025 |
| Jmvocea Ltd | Construction | 2024 |
| JMW Aluminium Ltd | Construction | 2025 |
| JN Glass Limited | Manufacturing | 2021 |
| JNH Property Investment Ltd | Real estate | 2019 |
| JNJ Builders Ltd | Construction | 2024 |
| JNJ Property Holdings Ltd | Real estate | 2026 |
| JNK Optivision Ltd | Health & social care | 2022 |
| JNM Construction Limited | Construction | 2020 |
| Jnoon Limited | Wholesale & retail | 2026 |
| JNP LLP | | 2024 |
| JNR Traders Limited | Information & communication | 2020 |