| JP Alloy Wheel Refurbishment Limited | Manufacturing | 2022 |
| JP Construction Management Ltd | Professional & scientific | 2023 |
| JP Consultancy Solutions Ltd | Administrative & support | 2018 |
| JP Electrical Renewables Limited | Construction | 2025 |
| JP Residential Limited | Real estate | 2016 |
| JP88 Ltd | Transport & logistics | 2025 |
| JPA Healthcare Limited | Health & social care | 2019 |
| JPB Telecoms Ltd | Construction | 2023 |
| JPC Industrial Services Limited | Professional & scientific | 2024 |
| JPC Logistics Ltd | Transport & logistics | 2026 |
| Jplk Property Ltd | Real estate | 2021 |
| JPM Roofcare Limited | Construction | 2025 |
| JPR Sales Ltd | Wholesale & retail | 2021 |
| JPS Fire Protection Limited | Administrative & support | 2002 |
| JPS Properties (Doncaster) Ltd | Real estate | 2023 |
| Jpsb Cornerstone Properties Ltd | Real estate | 2025 |
| Jptm Ltd | Public administration | 2023 |
| JQ4 Sports Ltd | Arts & recreation | 2024 |
| JR & MR Holdings Limited | Financial services | 2017 |
| JR Developments (Rossington Street) Ltd | Real estate | 2025 |
| JR Hudson Civil Rail Ltd | Professional & scientific | 2018 |
| JR Smith Wholesale Ltd | Wholesale & retail | 2025 |
| JR Transport & Recovery Ltd | Transport & logistics | 2025 |
| JR WAX ‘N’ Tune Services Ltd | Wholesale & retail | 2023 |
| JR6 Installs Ltd | Construction | 2025 |
| JRA Pizza Limited | Hospitality | 2024 |
| JRA Roofing & Leadwork Ltd | Construction | 2026 |
| JRB Developments (UK) Limited | Real estate | 2007 |
| JRB Electrical (Doncaster) Limited | Construction | 2019 |
| JRC Cladding Ltd | Construction | 2020 |
| JRH Design Services Ltd | Arts & recreation | 2025 |
| Jrichardson Properties Limited | Real estate | 2023 |
| JRM Investment Solutions Limited | Financial services | 2026 |
| JRN Heavy Haulage Ltd | Transport & logistics | 2023 |
| JRS Drainage Solutions Ltd | Construction | 2024 |
| Jrsh Autos Ltd | Wholesale & retail | 2026 |
| Jr’S at the Inn Limited | Hospitality | 2026 |
| JS and SON Roofing Ltd | Construction | 2025 |
| JS Bookkeeping & Accounting Solutions Ltd | Professional & scientific | 2025 |
| JS Consultancy PVT Ltd | Administrative & support | 2020 |
| JS Elevator Limited | Construction | 2025 |
| JS Home Solutions Limited | Construction | 2015 |
| Jsby Properties Limited | Real estate | 2025 |
| JSD Investment Properties Ltd | Real estate | 2016 |
| JSJ Management Ltd | Real estate | 2026 |
| Jskb Limited | Real estate | 2025 |
| JSP Investments Limited | Real estate | 2016 |
| JSS UK Investment Ltd | Real estate | 2012 |
| Jstk Ltd | Health & social care | 2025 |
| JSV Courier Limited | Transport & logistics | 2020 |
| JSW Doncaster Ltd | Real estate | 2018 |
| JSW Landscaping Limited | Administrative & support | 2026 |
| JSW Property Maintenance Ltd | Construction | 2025 |
| Jszjs Limited | Wholesale & retail | 2025 |
| JT 46 DS Limited | Construction | 2025 |
| JT Building & Joinery Services Ltd | Construction | 2003 |
| JT Catherine Street Limited | Construction | 2025 |
| JT Electrical & Renewables Limited | Construction | 2023 |
| JT Kirkgate Limited | Construction | 2025 |
| JT Management Group Ltd | Professional & scientific | 2023 |
| JT Motorsport Ltd | Professional & scientific | 2014 |
| JT Private Finance Limited | Financial services | 2006 |
| JT Prop Co Ltd | Hospitality | 2021 |
| JT Property & Maintenance Services (Harrogate) Limited | Construction | 2002 |
| JT Property Development Holdings Ltd | Real estate | 2024 |
| JT Property Lettings Ltd | Real estate | 2020 |
| JT Slurry Seal Ltd | Construction | 2025 |
| JT Transport & Regulation Consulting Ltd | Transport & logistics | 2024 |
| JTH Couriers Ltd | Transport & logistics | 2025 |
| JTL Personnel Limited | Administrative & support | 2024 |
| JTP Electrics Ltd | Manufacturing | 2016 |
| JTP Plumbing & Heating Doncaster Ltd | Construction | 2023 |
| JTT and Sons Limited | Professional & scientific | 2020 |
| Jt’S Scrap to Road Motor’S Ltd | Wholesale & retail | 2024 |
| Judd Paint Solutions Limited | Wholesale & retail | 2007 |
| Jude Catterall TM Ltd | Public administration | 2025 |
| Judi Hayfield Limited | Administrative & support | 2006 |
| Judith Bantock Limited | Administrative & support | 2021 |
| Juds TM Ltd | Public administration | 2024 |
| JUK Cleaning Ltd | Administrative & support | 2003 |
| Jukes Timber Supplies Limited | Wholesale & retail | 2023 |
| Julian Transport 2018 Ltd | Transport & logistics | 2018 |
| Julian Transporting Limited | Transport & logistics | 2019 |
| Julie Kong Legal Services Ltd | Professional & scientific | 2025 |
| Julie Marie Dyer Limited | Extraterritorial | 2024 |
| Julius Aesthetics Ltd | Health & social care | 2023 |
| July 11, 2014 Limited | Professional & scientific | 2014 |
| Julya Smile Hair Limited | Other services | 2025 |
| Julyhouse Limited | Administrative & support | 2004 |
| Jumilla Consultancy Limited | Professional & scientific | 2016 |
| Jumpin Jacks Nursery Limited | Health & social care | 2014 |
| Junction 36 (Doncaster) Ltd | Wholesale & retail | 2014 |
| Junction 4 Limited | Real estate | 2016 |
| Junction 4 Vauxhall Specialists Ltd | Wholesale & retail | 2013 |
| Junction Food Store Ltd | Wholesale & retail | 2025 |
| Junga's Family Kitchen Ltd | Hospitality | 2024 |
| Jungle Codes Ltd | Information & communication | 2025 |
| Jungle TM Ltd | Public administration | 2025 |
| Junior Star Ltd | Hospitality | 2025 |
| Juniper Halo Ltd | Extraterritorial | 2025 |