| JP Shipping Services Limited | Transport & logistics | 2023 |
| JPA Solutions Ltd | Professional & scientific | 2026 |
| JPB Developments IOW Limited | Real estate | 2023 |
| Jpinspectionservices Ltd | Professional & scientific | 2024 |
| JPK (Llanmartin) Limited | Hospitality | 2004 |
| JPR Group Holdings Limited | Manufacturing | 2025 |
| Jpr’S Building Solutions Ltd. | Construction | 2025 |
| JPT Construction & Engineering Ltd | Construction | 2023 |
| JPV Landscaping and Gardening Ltd | Construction | 2026 |
| JPW Spares Limited | Wholesale & retail | 2006 |
| JQD Consultancy Ltd | Professional & scientific | 2022 |
| JR 88 Limited | Hospitality | 2026 |
| JR Electrical Limited | Construction | 2023 |
| JR Fencing & Sons Limited | Construction | 2005 |
| JR Project Management Services Limited | Construction | 2023 |
| JR Superior Homes Ltd | Construction | 2020 |
| Jra's Care Ltd | Health & social care | 2018 |
| JRB Pool Construction Ltd | Construction | 2025 |
| Jrfacilities Ltd | Administrative & support | 2024 |
| JRJ Engineering Solutions Ltd | Professional & scientific | 2022 |
| JRL Enterprises Limited | Real estate | 2012 |
| Jrnova Ltd | Financial services | 2026 |
| Jrzg Trading Limited | Hospitality | 2024 |
| JS & K Construction Ltd | Construction | 2026 |
| JS Medivape Lounge Limited | Health & social care | 2024 |
| JS15 Ltd | Information & communication | 2022 |
| JSB Civil Solutions Ltd | Construction | 2022 |
| JSB Group Homes Ltd | Real estate | 2025 |
| JSB Property Enterprises Ltd | Real estate | 2022 |
| JSJ Kullars Limited | Real estate | 2007 |
| Jslr Limited | Wholesale & retail | 2008 |
| JSM Accommodation Ltd | Real estate | 2018 |
| JSM Asset Developments Ltd | Real estate | 2019 |
| JSM Coaching Services Ltd | Arts & recreation | 2018 |
| JSM Collective Limited | Real estate | 2026 |
| Jsob Trading Limited | Wholesale & retail | 2019 |
| JSP Media Telford Limited | Professional & scientific | 2013 |
| Jssb Accountancy Solutions Ltd | Professional & scientific | 2012 |
| Jstar Consultants Limited | Professional & scientific | 2025 |
| JT 6 Limited | Administrative & support | 2013 |
| JT Book Keeping Solutions Limited | Professional & scientific | 2012 |
| JT Detailing Ltd | Administrative & support | 2024 |
| JT International Ltd | Real estate | 2019 |
| JT Page Property Ltd | Real estate | 2025 |
| Jtblades Limited | Manufacturing | 2024 |
| JTL Fire and Security Limited | Administrative & support | 2024 |
| JTV Brickwork Ltd | Construction | 2024 |
| Jubilee Park (Rogerstone) Management Company Limited | Administrative & support | 2013 |
| Jud-Human RTS Organization Ltd | Health & social care | 2025 |
| Judd Developments Limited | Construction | 2012 |
| Jude Security Limited | Administrative & support | 2003 |
| Judith Clark Studio Limited | Professional & scientific | 2014 |
| Juicetin Limited | Professional & scientific | 2023 |
| Julia Addams-Williams Limited | Health & social care | 2016 |
| Julia Robinson Limited | Other services | 2003 |
| Julten Healthcare Ltd | Public administration | 2026 |
| Jump Adventure Childcare Ltd | Health & social care | 2019 |
| Jumping Spiders Web Ltd | Agriculture & fishing | 2020 |
| Jumping Spiders Web Wholesale Limited | Wholesale & retail | 2025 |
| Jumpkey Property Limited | Hospitality | 2025 |
| Jungle Goat Ltd | Wholesale & retail | 2022 |
| Jungle Peri Peri Ltd | Hospitality | 2021 |
| Junoflow Consulting Limited | Professional & scientific | 2023 |
| Jusj Limited | Transport & logistics | 2022 |
| Just ASK the M.R.S Ltd | Transport & logistics | 2021 |
| Just B2B Utilities Ltd | Energy | 2023 |
| Just Beams Limited | Construction | 2023 |
| Just Nails Studio Limited | Other services | 2017 |
| Justin Raymond Limited | Professional & scientific | 2023 |
| JV Ventilation Ltd | Construction | 2020 |
| JVD Partnership Ltd | Professional & scientific | 2022 |
| JW Driver Training Ltd | Education | 2018 |
| JW8 Promotions Limited | Arts & recreation | 2021 |
| Jwautoshineshop Ltd | Wholesale & retail | 2021 |
| JWB Leisure Ltd | Hospitality | 2020 |
| JWP (UK) Limited | Administrative & support | 2011 |
| JWS Management Holdings Limited | Financial services | 2019 |
| JWT Associates Limited | Financial services | 2013 |
| JWW Distribution Ltd | Wholesale & retail | 2020 |
| JZP Holdings Limited | Financial services | 2018 |
| JZP Limited | Construction | 2013 |
| K & G Body Repairs Limited | Wholesale & retail | 2019 |
| K & G Car Sales Limited | Wholesale & retail | 2019 |
| K & J Crafts Limited | Wholesale & retail | 2012 |
| K & J Wright Ltd | Manufacturing | 2017 |
| K & R Wellness and Recovery Ltd | Other services | 2025 |
| K & T Construction Services Ltd | Construction | 2018 |
| K a Upholstery Services Ltd | Manufacturing | 2026 |
| K and N Trading Ltd | Wholesale & retail | 2026 |
| K Coghlan Plant and Transport Limited | Administrative & support | 2009 |
| K D Clarke Properties Limited | Real estate | 2019 |
| K G (Holdings) Limited | Financial services | 2014 |
| K Gotobed Limited | Construction | 2016 |
| K M Construction and Maintenance Ltd | Construction | 2022 |
| K M Plant Hire & Groundworks Limited | Construction | 2010 |
| K M Plant Ltd | Construction | 2016 |
| K Mckeown Property Limited | Real estate | 2022 |
| K Pook Brickwork Limited | Construction | 2023 |
| K W Dorrington Architectural Associates Ltd | Professional & scientific | 2024 |
| K W Dorrington Ltd | Real estate | 2018 |