| JT Property Finance Ltd | Financial services | 2025 |
| JT Trade Ltd | Manufacturing | 2018 |
| JT UK Housing Limited | Real estate | 2023 |
| JT Waters Media Ltd | Information & communication | 2022 |
| Jt@Brothers Limited | Wholesale & retail | 2025 |
| JTA Holdings Limited | Professional & scientific | 2002 |
| Jtai Beauty Ltd | Education | 2018 |
| JTB Investments Group Limited | Real estate | 2026 |
| Jtec Property Limited | Real estate | 2008 |
| JTK Build Ltd | Transport & logistics | 2025 |
| JTM Groundworks Ltd | Construction | 2025 |
| Jtms Properties Ltd | Real estate | 2016 |
| Jtnb Holdings Ltd | Other services | 2023 |
| JTS Chauffeur Services Limited | Transport & logistics | 2022 |
| JTS Executive Cars Ltd | Transport & logistics | 2018 |
| JTS Midlands Ltd | Financial services | 2025 |
| JTS Property Management Ltd | Real estate | 2022 |
| Jtsol | Financial services | 2023 |
| JTT Consulting Ltd | Professional & scientific | 2024 |
| JTW Traffic Ltd | Other services | 2021 |
| Jtwa Limited | Real estate | 2024 |
| Juar Investments Ltd | Other services | 2019 |
| Juba Transport Ltd | Transport & logistics | 2021 |
| Jubair Game Development Ltd | Information & communication | 2025 |
| Jubaris UK Limited | Other services | 2016 |
| Juber & Co Ltd | Professional & scientific | 2024 |
| Juberent Property Ltd | Real estate | 2025 |
| Jubilee Car Parts Ltd | Wholesale & retail | 2018 |
| Jubilee Community Support Centre | Other services | 2009 |
| Jubilee Consolidated LLP | | 2023 |
| Jubilee Dental Technology Limited | Health & social care | 2014 |
| Jubilee Gardens (North Shields) Residents Management Company Limited | Households | 2026 |
| Jubilee Inn Cannock Limited | Real estate | 2026 |
| Jubilee International Touring Limited | | 1979 |
| Jubilee Midlands Limited | Public administration | 2022 |
| Jubilee Quality Workplace Health and Wellbeing Ltd | Health & social care | 2024 |
| Jubilee Year Consultants Limited | Health & social care | 2019 |
| Jublietec Ltd | Wholesale & retail | 2026 |
| Jubran Ltd | Wholesale & retail | 2019 |
| Jubsjobs Ltd | Construction | 2026 |
| Judd Enterprises Ltd | Real estate | 2021 |
| Judge Tyres Ltd | Wholesale & retail | 2023 |
| Judy Owen Limited | Arts & recreation | 2003 |
| Juggernaut Studio Limited | Information & communication | 2026 |
| Juglans Investments | Financial services | 2012 |
| Jugni Original by Arif Lohar Ltd | Manufacturing | 2023 |
| Jugno Export Limited | Information & communication | 2025 |
| Jugnu Designers Ltd | Wholesale & retail | 2022 |
| Juice 4 Life Limited | Wholesale & retail | 2025 |
| Juice and Bites Ltd | Hospitality | 2026 |
| Juice Bar & Dessert Limited | Hospitality | 2025 |
| Juice for Life Bedford Ltd | Wholesale & retail | 2026 |
| Juice House Limited | Hospitality | 2025 |
| Juice Inn Limited | Manufacturing | 2026 |
| Juice Time Limited | Wholesale & retail | 2025 |
| Juice Tipton Ltd | Hospitality | 2025 |
| Juice Vapore Ltd | Hospitality | 2023 |
| Juice-A-Licious Limited | Hospitality | 2025 |
| Juiceberry Ltd | Hospitality | 2021 |
| Juices 4 Life Franchises Ltd | Manufacturing | 2025 |
| Juices 4 Life Ltd | Manufacturing | 2024 |
| Juices 4 YOU Ltd | Manufacturing | 2025 |
| Juices Your Life Limited | Extraterritorial | 2026 |
| JUICES4EVER Ltd | Wholesale & retail | 2024 |
| Juicestation Ltd | Wholesale & retail | 2026 |
| Juicetopia Ltd | Hospitality | 2025 |
| Juici Limited | Extraterritorial | 2014 |
| Juici Patties Limited | Extraterritorial | 2014 |
| Juicy B'S Bakery Ltd | Manufacturing | 2024 |
| Juicy Face Aesthetics Ltd | Health & social care | 2017 |
| Juicy J Ltd | Hospitality | 2026 |
| Juicy Junction Limited | Manufacturing | 2026 |
| Juicy Tea Limited | Hospitality | 2018 |
| Juicyllama Limited | Information & communication | 2019 |
| Jujuz Ltd | Wholesale & retail | 2025 |
| Juksiya Ltd | Information & communication | 2025 |
| Juland Limited | Transport & logistics | 2016 |
| Jules P.Multiservices Limited | Health & social care | 2016 |
| Julia Slush Factory Limited | Wholesale & retail | 2024 |
| Julian Young Building Ltd | Construction | 2017 |
| Julie English Interiors Ltd | Wholesale & retail | 2020 |
| Julie Hensler Theexecspace Ltd | Other services | 2021 |
| Julien London Ltd | Wholesale & retail | 2025 |
| Julip Cleaning Services Ltd | Administrative & support | 2025 |
| Julke Fashion UK Limited | Wholesale & retail | 2023 |
| July Consultancy Limited | Administrative & support | 2018 |
| July the Third Limited | Professional & scientific | 2022 |
| Julymay Ltd | Wholesale & retail | 2026 |
| JUM Foods Limited | Wholesale & retail | 2024 |
| Juma Investment Properties Ltd | Real estate | 2021 |
| Jumary Autos Ltd | Wholesale & retail | 2021 |
| Jumary Construction Limited | Construction | 2024 |
| Jumblether Ltd | Administrative & support | 2024 |
| Jumbo Midlands Ltd | Wholesale & retail | 2015 |
| Jumec Ltd | Energy | 2024 |
| Jumeira Coffee Costs Limited | Administrative & support | 2025 |
| Jumeira Coffee Limited | Hospitality | 2024 |
| Jumeirah Group UK Ltd | Financial services | 2025 |
| Jumi Developments Limited | Administrative & support | 2013 |
| Jummah Ltd | Health & social care | 2018 |