| JJ Transport Leeds Ltd | Transport & logistics | 2019 |
| Jj's Corner Cafe Ltd | Hospitality | 2023 |
| Jj's Decorating Ltd | Construction | 2018 |
| JJA Transport Limited | Transport & logistics | 2015 |
| JJB Groundworks & Demolition Ltd | Construction | 2021 |
| JJC Property Holdings Ltd | Real estate | 2022 |
| JJG Consultancy Ltd | Professional & scientific | 2025 |
| JJG Real Estate Limited | Real estate | 2012 |
| JJH Electrical Solutions Ltd | Construction | 2024 |
| JJM Electrical Ltd | Construction | 2015 |
| JJM Heating Ltd | Construction | 2024 |
| JJN Property (Leeds) Limited | Real estate | 2025 |
| Jjproperty Scarborough Ltd | Hospitality | 2016 |
| Jjrtech Ltd | Information & communication | 2019 |
| Jjsk (Yorkshire) Limited | Education | 2016 |
| Jjsk Primary Limited | Education | 2021 |
| Jjsk Secondary Limited | Education | 2021 |
| Jjss Properties Ltd | Real estate | 2020 |
| JJV Properties (Leeds) Limited | Real estate | 2022 |
| JJW Contracting Ltd | Construction | 2022 |
| Jj’S Catering Services Ltd | Hospitality | 2022 |
| JK & KS Services Ltd | Wholesale & retail | 2024 |
| JK Birk Developments Ltd | Construction | 2025 |
| JK Building Service Leeds Ltd | Construction | 2022 |
| JK Business Management Consulting Ltd | Other services | 2020 |
| JK Fire Suppression Ltd | Construction | 2024 |
| JK Fisheries Limited | Hospitality | 2014 |
| JK Group Enterprise Ltd | Other services | 2018 |
| JK Local Ltd | Wholesale & retail | 2025 |
| JK Lone Estates Ltd | Real estate | 2026 |
| JK Manners Ltd | Transport & logistics | 2019 |
| JK Market Limited | Wholesale & retail | 2022 |
| JK Medical Services Limited | Administrative & support | 2008 |
| JK Properties and Lettings Ltd | Real estate | 2026 |
| JK Properties NW Ltd | Real estate | 2022 |
| JK Reformer Pilates Studio Ltd | Arts & recreation | 2025 |
| JK Refurbs Ltd | Construction | 2016 |
| JKA Infotech Limited | Information & communication | 2011 |
| JKB Optical Limited | Health & social care | 2024 |
| Jkbb Services Ltd | Financial services | 2023 |
| JKC (Maintenance) Ltd | Construction | 2011 |
| JKC 2009 Ltd | Wholesale & retail | 2009 |
| JKC Fisheries Ltd | Hospitality | 2024 |
| JKC Group Limited | Construction | 2017 |
| JKC Holdings Limited | Manufacturing | 2020 |
| JKC Properties Limited | Real estate | 2024 |
| JKL Contracts Limited | Construction | 2015 |
| JKL Estates Ltd | Households | 2025 |
| JKL Haulage Ltd | Other services | 2021 |
| JKL Holdings Ltd | Construction | 2024 |
| JKL Plant Hire Ltd. | Administrative & support | 2001 |
| JKL Storage Ltd | Real estate | 2019 |
| JKM Motor Holdings Limited | Wholesale & retail | 2023 |
| JKP Autocare Ltd | Wholesale & retail | 2025 |
| Jkrd Ltd | Real estate | 2018 |
| Jkrs Group Ltd | Real estate | 2024 |
| Jkrs Premium Investments Ltd | Real estate | 2026 |
| JKS Invest Limited | Financial services | 2021 |
| JKS Law Ltd | Professional & scientific | 2014 |
| JKS Properties Limited | Real estate | 2018 |
| JKS Property Holdings Limited | Real estate | 2021 |
| Jkstar Photography Ltd | Information & communication | 2023 |
| Jktwmn Ltd | Real estate | 2018 |
| JL Advisory & Co Ltd | Administrative & support | 2025 |
| JL Building Solutions (Yorkshire) Ltd | Construction | 2020 |
| JL Developments & Co (UK) Ltd | Real estate | 2019 |
| JL Grounds Maintenance Limited | Administrative & support | 2023 |
| JL Joinery & Kitchens Ltd | Construction | 2025 |
| JL Plastering & Developments Ltd | Construction | 2025 |
| Jlart Ltd | Wholesale & retail | 2011 |
| Jlaw Logistics Ltd | Transport & logistics | 2023 |
| Jlaw Media Ltd | Information & communication | 2025 |
| Jlaw Retail Ltd | Wholesale & retail | 2026 |
| Jlc-Mig(Uk) Limited | Wholesale & retail | 2013 |
| JLD Holdings Limited | Financial services | 2018 |
| JLD Roofing Ltd | Construction | 2025 |
| Jlec Electrical Limited | Manufacturing | 2005 |
| JLF Racing Ltd | Arts & recreation | 2024 |
| JLG Construction Projects Ltd | Construction | 2025 |
| JLH Legal Limited | Professional & scientific | 2017 |
| Jlif Holdings (Justice and Emergency Services) Limited | Financial services | 2014 |
| Jlif Holdings (Pembury Hospital) Limited | Professional & scientific | 2012 |
| Jlife Limited | Information & communication | 2011 |
| Jljohnson Ltd | Hospitality | 2024 |
| JLK International Ltd | Wholesale & retail | 2019 |
| JLM Coaching & Consulting Ltd | Professional & scientific | 2025 |
| JLP Property Ltd | Real estate | 2019 |
| JLS (Oxford Court) Limited | Professional & scientific | 2004 |
| JLS Team Management Limited | Real estate | 2020 |
| JLT Digital Ltd | Professional & scientific | 2026 |
| JM Academy Ltd | Wholesale & retail | 2022 |
| JM Bridge Properties Ltd | Real estate | 2019 |
| JM Brown Construction Ltd | Construction | 2025 |
| JM Coaching and Consultancy Ltd | Professional & scientific | 2019 |
| JM Developments (Fearns Wharf) Limited | Construction | 2022 |
| JM Digital Consultancy Limited | Professional & scientific | 2025 |
| JM Grainge Plumbing & Heating Ltd | Construction | 2026 |
| JM Group Holdings Limited | Financial services | 2026 |
| JM Property Solutionz Limited | Real estate | 2023 |
| JM Protection Limited | Financial services | 2021 |