| Jessi Porphyrio Hair Ltd | Other services | 2024 |
| Jessie Driving School Limited | Education | 2019 |
| Jet-Kod Limited | Hospitality | 2026 |
| Jewels Conference Suite Limited | Other services | 2011 |
| Jezé Gyasi Ltd | Wholesale & retail | 2025 |
| Jgweducation Ltd | Education | 2021 |
| Jhander Transport Ltd | Transport & logistics | 2020 |
| Jheeta Property Group Ltd | Real estate | 2022 |
| JHK World Ltd | Real estate | 2021 |
| JHP Properties WM Ltd | Real estate | 2026 |
| Jinda Car Sales Ltd | Wholesale & retail | 2026 |
| Jiya Sisters Limited | Wholesale & retail | 2025 |
| JJ Constructions(West Midlands) Ltd | Construction | 2021 |
| JJ Remodeling Ltd | Construction | 2024 |
| Jj&R Properties Limited | Real estate | 2025 |
| JJB Properties Ltd | Real estate | 2015 |
| JK Fish Bar Ltd | Hospitality | 2020 |
| JK4 Service Limited | Transport & logistics | 2025 |
| JKB Trading Limited | Construction | 2025 |
| JKN Contractors Ltd | Transport & logistics | 2019 |
| JKN Holdings Ltd | Real estate | 2025 |
| JLI Commercial Limited | Construction | 2022 |
| Jlpg Ltd | Wholesale & retail | 2022 |
| JLR Computers Ltd | Construction | 2020 |
| JLR Software Ltd | Construction | 2020 |
| Jlrk Limited | Real estate | 2021 |
| JLS (Smethwick) Engineering Limited | Wholesale & retail | 2019 |
| JM & KM Group Limited | Professional & scientific | 2015 |
| JM Care WM Ltd | Health & social care | 2022 |
| JM Laundry Services Ltd | Manufacturing | 2023 |
| JM Shop & Vape Ltd | Wholesale & retail | 2025 |
| JM Shop 1 Ltd | Wholesale & retail | 2025 |
| Jmarsh Consultancy Ltd | Health & social care | 2022 |
| JMM Properties WM Ltd | Real estate | 2024 |
| JMS Solutions WM Ltd | Professional & scientific | 2025 |
| JNJ Sheemar Limited | Wholesale & retail | 2022 |
| Jns(Uk) Ltd | Construction | 2020 |
| JO Aesthetics Ltd | Other services | 2024 |
| JOE Estates Limited | Real estate | 2024 |
| Joell Cleaning Services Ltd | Administrative & support | 2022 |
| Johal Roadways Limited | Transport & logistics | 2020 |
| Johal Wholesale Building Merchant Ltd | Wholesale & retail | 2025 |
| Johal Wholesale Ltd | Wholesale & retail | 2022 |
| Johar Ahmed Ltd | Wholesale & retail | 2022 |
| John Quarterman Ltd | Construction | 2017 |
| Jonathans in the Park Limited | Hospitality | 2017 |
| Jony Home Ltd | Construction | 2023 |
| Jordan GAS Services Ltd | Construction | 2022 |
| Josan Medical Limited | Health & social care | 2008 |
| JOT Transportation Services UK 0909 Limited | Transport & logistics | 2025 |
| Joy Established Success Unending Supreme Boutique Limited | Wholesale & retail | 2024 |
| Joytara Limited | Hospitality | 2025 |
| Jozzy Hair and Beauty Salon Ltd | Other services | 2025 |
| JPA DES1GN Limited | Professional & scientific | 2023 |
| JPK Investments Ltd | Real estate | 2016 |
| JPT Repair Services Ltd | Other services | 2015 |
| JQ Domestic Interiors Ltd | Construction | 2025 |
| Jqpm Ltd | Professional & scientific | 2023 |
| JRW & Sons Construction Ltd | Construction | 2026 |
| JS Care Providers Ltd | Health & social care | 2022 |
| JS Carriers Ltd | Transport & logistics | 2025 |
| JS Elite Consulting Limited | Health & social care | 2022 |
| JS Estate Investments Ltd | Real estate | 2023 |
| JS Linx Ltd | Construction | 2024 |
| JS Sidhu Buildings Ltd | Construction | 2022 |
| JSB Bathrooms WM Ltd | Construction | 2026 |
| JSF Steel Fabricators Ltd | Manufacturing | 2022 |
| Jsfashionsuits Ltd | Wholesale & retail | 2025 |
| JSH Services WM Ltd | Hospitality | 2025 |
| JSK Transport (Midlands) Ltd | Transport & logistics | 2020 |
| JSL Properties WM Ltd | Real estate | 2026 |
| JSM Properties WM Ltd | Real estate | 2021 |
| JSN Trading Limited | Wholesale & retail | 2025 |
| JSS Stores Ltd | Wholesale & retail | 2017 |
| JSU & Sons Ltd | Real estate | 2026 |
| JSW Emery Ltd | Manufacturing | 2017 |
| JTM Bedroom & Kitchen Ltd | Construction | 2025 |
| Jtpropertymanagement(Uk) Ltd | Real estate | 2025 |
| Judi Transport Ltd | Transport & logistics | 2021 |
| Jugaadh Transport Ltd | Transport & logistics | 2024 |
| Juiceology Limited | Wholesale & retail | 2025 |
| Julia Knowles Limited | Information & communication | 2010 |
| Julia's Improvement Limited | Construction | 2022 |
| Jupiter Seven Ltd | Real estate | 2020 |
| Jurgen Ltd | Construction | 2025 |
| Just Express Ltd | Wholesale & retail | 2024 |
| Just Munslow Properties Ltd | Real estate | 2026 |
| Justmuslim | Professional & scientific | 2025 |
| Jvine Ltd | Construction | 2023 |
| Jvys Solutions Ltd | Information & communication | 2017 |
| K & K Dynamic Traders Ltd | Other services | 2025 |
| K and K Engineering Ltd | Professional & scientific | 2025 |
| K Barrett Roofing Ltd | Construction | 2016 |
| K Hand Car Wash Ltd | Wholesale & retail | 2022 |
| K K Welding Ltd | Professional & scientific | 2017 |
| K Parker Pa's Ltd | Administrative & support | 2025 |
| K S Bassan Joinery and Carpentry Limited | Construction | 2020 |
| K.I.I.M.S Property Group Limited | Real estate | 2021 |
| K2 Training Associates Ltd | Professional & scientific | 2010 |
| K2 UK Refrigeration Ltd | Manufacturing | 2026 |