| Jsns Properties Ltd | Real estate | 2023 |
| JSO PUB Company Limited | Hospitality | 2019 |
| JSP Portside Ltd | Real estate | 2024 |
| Jspd Engineering Limited | Construction | 2024 |
| Jspd Limited | Real estate | 2020 |
| Jsrice Limited | Hospitality | 2013 |
| Jsrr Limited | Administrative & support | 2019 |
| JSS Food Hub UK Ltd | Hospitality | 2023 |
| JST Compete Ltd | Health & social care | 2020 |
| JST Drylining & Plastering Ltd | Construction | 2019 |
| JST Train Ltd | Other services | 2020 |
| JT ALL Trades Ltd | Construction | 2016 |
| JT and J Properties Ltd | Real estate | 2023 |
| JT Family Investment Company Limited | Professional & scientific | 2026 |
| JT Patton Property Ltd | Real estate | 2025 |
| JT Reliance Hospitality Ltd | Other services | 2022 |
| JT Retail Group Ltd | Wholesale & retail | 2025 |
| JT Sefton Limited | Hospitality | 2025 |
| JT Seven Group Limited | Financial services | 2021 |
| JT Soccer Limited | Arts & recreation | 2017 |
| JTA Care Services (NW) Limited | Health & social care | 2024 |
| JTA Care Services Limited | Health & social care | 2023 |
| Jtaz Ltd | Other services | 2018 |
| JTB Property Sales Ltd | Real estate | 2021 |
| Jtek Engineering Services Ltd | Professional & scientific | 2024 |
| JTG Advisory Group Ltd | Administrative & support | 2025 |
| JTI Concept Limited | Wholesale & retail | 2019 |
| Jtjj Enterprise Limited | Hospitality | 2023 |
| JTL Courier Services Limited | Transport & logistics | 2017 |
| JTM Construction Ltd | Construction | 2026 |
| JTM Engineering (NW) Limited | Manufacturing | 2021 |
| JTM Medical Ltd | Health & social care | 2021 |
| JTM Pro Sports Ltd | Arts & recreation | 2021 |
| JTM Properties & Lettings Limited | Households | 2025 |
| JTN Tiling Ltd | Construction | 2025 |
| JTR Property and Holdings Limited | Real estate | 2025 |
| JTS (Jays Telecom Services) Limited | Information & communication | 2025 |
| JTS Gifts & Prizes Ltd | Wholesale & retail | 2008 |
| JTS Swanson Accounting & Bookkeeping Ltd | Professional & scientific | 2026 |
| Jtsy Textiles Limited | Wholesale & retail | 2023 |
| JTV Audio Ltd | Information & communication | 2023 |
| JUB and SON Construction Limited | Construction | 2023 |
| Jubilee Management 20 Limited | Real estate | 2020 |
| JUDE4 Limited | Professional & scientific | 2025 |
| Judeber Homes Limited | Real estate | 2018 |
| Judex Healthcare Ltd. | Health & social care | 2017 |
| Judge IT Consulting Ltd | Information & communication | 2023 |
| Judges Developments Ltd | Real estate | 2023 |
| Judges Property Ltd | Real estate | 2022 |
| Judicial Accounting Solutions Ltd | Professional & scientific | 2003 |
| Judie Properties Ltd | Real estate | 2024 |
| Judith E Palfreyman Trading Limited | Professional & scientific | 2017 |
| Judith K Ltd | Health & social care | 2014 |
| Judith Williamson & Associates Ltd | Administrative & support | 2015 |
| Jugglers Yard Management Company Limited | Households | 2005 |
| Juice Boost Limited | Manufacturing | 2023 |
| Juicy Nails KLM Ltd | Other services | 2025 |
| Juju VFX Ltd | Information & communication | 2021 |
| Jukes Construction Ltd | Construction | 2022 |
| Julcofs Recruitment Limited | Health & social care | 2022 |
| Julia Kanik Homes Ltd | Real estate | 2025 |
| Julian Blakey Limited | Health & social care | 2025 |
| Julian Motorcycles Limited | Wholesale & retail | 2024 |
| Julie ANN Ashworth Ltd | Other services | 2025 |
| Julie E Murray Consultancy Services Ltd | Financial services | 2025 |
| Julie Lawson Community Events CIC | Health & social care | 2019 |
| Julier Management Ltd | Administrative & support | 2020 |
| Julies Coffee Co Ltd | Hospitality | 2023 |
| Juliette Rose Investment 2 Limited | Financial services | 2022 |
| Juliette Rose Investment Limited | Financial services | 2021 |
| Julu Express Ltd | Wholesale & retail | 2022 |
| Jumbo 559 Ltd | Hospitality | 2024 |
| Jumbo Allerton Limited | Hospitality | 2025 |
| Jumbo City Restaurant Ltd | Hospitality | 2017 |
| Jumentess Limited | Professional & scientific | 2025 |
| Jumoo Ltd | Information & communication | 2011 |
| Jump Safe Limited | Manufacturing | 2016 |
| Jumping Jacks Events Limited | Education | 2009 |
| Jumping Jacks Limited | Education | 2002 |
| Jumping Prospects Ltd | Information & communication | 2004 |
| Jumpwire Limited | Information & communication | 2007 |
| June Boom Limited | Wholesale & retail | 2025 |
| June Dunne Limited | Manufacturing | 2010 |
| Junecontain Ltd | Manufacturing | 2025 |
| Junerose Housing Ltd | Hospitality | 2018 |
| Junerose Ltd | Health & social care | 2017 |
| Jungle Capital Ltd | Information & communication | 2011 |
| Jungle FUN Limited | Arts & recreation | 2007 |
| Jungle Play Limited | Health & social care | 2024 |
| Junico Imaging Ltd | Health & social care | 2024 |
| Juno Birch Ltd | Arts & recreation | 2021 |
| Juno Land and Building Limited | Real estate | 2019 |
| Juno N/W Ltd | Administrative & support | 2018 |
| Juno Support Services Ltd | Administrative & support | 2021 |
| Juradale Limited | Wholesale & retail | 1978 |
| Jurgen.Win Limited | Administrative & support | 2022 |
| JUS Kidz | Health & social care | 2007 |
| JUS Property Ltd | Financial services | 2023 |
| Jusaki Property Management Ltd | Information & communication | 2021 |
| Jusilva Ltd | Transport & logistics | 2020 |