| Just Pressed 4 Time Limited | Professional & scientific | 2003 |
| Just Print Henry Limited | Manufacturing | 2019 |
| Just Rosie Ltd | Administrative & support | 2014 |
| Just Tea Birmingham Ltd | Hospitality | 2024 |
| Just TEC Motorsport Limited | Wholesale & retail | 2023 |
| Just the Fit Designs Ltd | Manufacturing | 2025 |
| Just Walk UK Ltd | Other services | 2025 |
| Justcanvases Ltd | Manufacturing | 2025 |
| JUSTE4KIDS CIC | Administrative & support | 2023 |
| Justease Ltd | Wholesale & retail | 2025 |
| Justeco Limited | Professional & scientific | 2023 |
| Justedetails Ltd | Administrative & support | 2026 |
| Justice Healthcare and Recruitment Ltd | Health & social care | 2019 |
| Justice Lawyers Ltd | Professional & scientific | 2020 |
| Justice Security Systems Limited | Other services | 1986 |
| Justice Wise Limited | Professional & scientific | 2014 |
| Justifico Assets I Limited | Administrative & support | 2015 |
| Justifico Property Limited | Administrative & support | 2008 |
| Justified Cleaning and Laundry Solutions Ltd | Administrative & support | 2026 |
| Justin Price (UK) Group Holdings Limited | Financial services | 2026 |
| Justincy Ltd | Wholesale & retail | 2025 |
| Justino Foods Limited | Wholesale & retail | 2017 |
| Justis and Jairus Investment Limited | Real estate | 2020 |
| Justivall & Associates Limited | Professional & scientific | 2012 |
| Justlove Care Services Ltd | Public administration | 2019 |
| Justoud Ltd | Wholesale & retail | 2023 |
| Juststayluxe Properties Ltd. | Wholesale & retail | 2023 |
| Justtest Ltd | Education | 2025 |
| Justynka Ltd | Wholesale & retail | 2018 |
| JUT Properties Ltd | Real estate | 2024 |
| JUT Transport Ltd | Transport & logistics | 2018 |
| Jutla Properties Ltd | Real estate | 2020 |
| Jutsum Medical Ltd | Health & social care | 2017 |
| Juum Limited | Manufacturing | 2025 |
| Juwell Ltd | Health & social care | 2021 |
| JV Autos Repair Ltd | Wholesale & retail | 2025 |
| JV Bearwood Ltd | Real estate | 2024 |
| JV Electrical Services Ltd | Construction | 2019 |
| JV Invested Pro-Living Ltd | Administrative & support | 2026 |
| JV Menai Bridge Limited | Hospitality | 2022 |
| JV TR Property Limited | Real estate | 2016 |
| Jvandbiggss Ltd | Professional & scientific | 2025 |
| JVC Solutions Limited | Information & communication | 2016 |
| JVH Broa Properties Limited | Real estate | 2025 |
| JVH Property Services Limited | Manufacturing | 2026 |
| JVL Johnny Victor Limited | Information & communication | 2020 |
| JVM Locum Services Ltd | Health & social care | 2015 |
| JVN Productions Ltd | Professional & scientific | 2018 |
| JVT Artisan Foods Ltd | Manufacturing | 2025 |
| JW Desserts Ltd | Wholesale & retail | 2026 |
| JW Devon Limited | Hospitality | 2023 |
| JW Fine Carpentry Ltd | Manufacturing | 2025 |
| JW Infinity Limited | Arts & recreation | 2024 |
| JW Management Advisory Limited | Professional & scientific | 2018 |
| JW Pacifica Limited | Real estate | 2021 |
| JW PUB Solutions Ltd | Hospitality | 2026 |
| JW UK Properties Limited | Real estate | 2018 |
| Jwar Ltd | Wholesale & retail | 2021 |
| Jwbc Limited | Hospitality | 2026 |
| JWCONSTRUCTION27 Limited | Construction | 2017 |
| Jwebly Ltd | Information & communication | 2026 |
| Jwg&G Ltd. | Information & communication | 2024 |
| JWH Insolvency Solutions Limited | Professional & scientific | 2023 |
| JWI Limited | Real estate | 2022 |
| JWL Innovation Ltd | Professional & scientific | 2013 |
| JWL Ventures Ltd | Financial services | 2024 |
| JWM Capital Limited | Financial services | 2025 |
| JWM Construction Services Ltd | Construction | 2011 |
| JWS Home Improvements Ltd | Construction | 2011 |
| JWW4U Limited | Wholesale & retail | 2012 |
| JWZ Properties Limited | Real estate | 2018 |
| JX3S Limited | Professional & scientific | 2025 |
| JX9 Ltd | Arts & recreation | 2025 |
| JXM Foods Limited | Hospitality | 2025 |
| JXR Recovery Ltd | Transport & logistics | 2022 |
| Jxy’S Auto Ltd | Wholesale & retail | 2025 |
| JY Autos Ltd | Wholesale & retail | 2021 |
| JY Epos Services Ltd | Wholesale & retail | 2019 |
| JY Steel Ltd | Wholesale & retail | 2021 |
| JYD Technology Limited | Wholesale & retail | 2021 |
| Jynder Fitness Ltd | Wholesale & retail | 2023 |
| Jyot's Cleaning Services Ltd | Administrative & support | 2022 |
| Jyotsna Ltd | Public administration | 2025 |
| Jyrus EDI Limited | Hospitality | 2014 |
| JYS Health Limited | Health & social care | 2020 |
| Jyusuf Ltd | Transport & logistics | 2023 |
| JZ Prop House Ltd | Manufacturing | 2026 |
| JZA Pharma Limited | Health & social care | 2024 |
| JZF Investment Ltd | Real estate | 2021 |
| JZJ Limited | Transport & logistics | 2017 |
| Jzmz Limited | Wholesale & retail | 2019 |
| Jzuk Limited | Hospitality | 2015 |
| Jöurmet Ltd | Hospitality | 2025 |
| J’Adore Grill Ltd | Hospitality | 2023 |
| K & S Oralcare Ltd | Health & social care | 2011 |
| K & a Ventures (UK) Ltd | Construction | 2018 |
| K & B Home Maintenance Ltd | Administrative & support | 2026 |
| K & C Hire and Supply Limited | Administrative & support | 2014 |
| K & C Holdings Limited | Professional & scientific | 2021 |
| K & F Electrical Midlands Ltd | Construction | 2025 |