| JG Tree Services Ltd | Administrative & support | 2025 |
| JGD Builders Ltd | Construction | 2021 |
| JGL Ltd | Professional & scientific | 2025 |
| JH Bespoke Training Ltd | Arts & recreation | 2021 |
| JH Properties and Developments Limited | Real estate | 2025 |
| JH SET Design Limited | Professional & scientific | 2021 |
| Jhlaw Properties Limited | Real estate | 2023 |
| Jhonny ENE Ltd | Transport & logistics | 2025 |
| JHR Wholesales Services Limited | Wholesale & retail | 2024 |
| JIB Logistics Ltd | Transport & logistics | 2019 |
| Jibba Dialler Ltd | Information & communication | 2022 |
| Jibba Group Limited | Financial services | 2023 |
| Jibba Jabba Internet Services Ltd | Information & communication | 2016 |
| Jigsaw Business Support Limited | Professional & scientific | 2023 |
| JIM Hetherton Limited | Professional & scientific | 2012 |
| Jimmy Piggs Limited | Hospitality | 2013 |
| Jimmy's Shop Ltd | Wholesale & retail | 2023 |
| Jiska Ltd | Wholesale & retail | 2024 |
| Jive Stylistic Ltd | Education | 2022 |
| Jiyan Foods Ltd | Hospitality | 2025 |
| JJ Electrico Limited | Construction | 2017 |
| JJ Gym Ltd | Arts & recreation | 2024 |
| JJ Property & Lettings Ltd | Real estate | 2020 |
| Jjac Ltd | Hospitality | 2023 |
| JJB Products Limited | Wholesale & retail | 2017 |
| JJB Wellness Centre Ltd | Education | 2024 |
| JJC Roadways Limited | Construction | 2023 |
| Jjgast Ltd | Manufacturing | 2020 |
| Jjmoffs Limited | Information & communication | 2017 |
| JJP Sports and Education Ltd | Education | 2026 |
| JJR TM Ltd | Construction | 2019 |
| JJS (Doncaster) Ltd | Wholesale & retail | 2022 |
| JK Barnsley Limited | Hospitality | 2026 |
| JK Edward Residential Ltd | Real estate | 2021 |
| JK Framing Ltd | Construction | 2026 |
| JK Planning and Design Service Limited | Professional & scientific | 2011 |
| JK Road Trans Ltd | Transport & logistics | 2014 |
| JK Shopfitters Ltd | Construction | 2018 |
| JK Transport Services Ltd | Transport & logistics | 2024 |
| Jkaay Ltd | Information & communication | 2017 |
| JKG Holdings Limited | Financial services | 2026 |
| JKG Limited | Financial services | 2026 |
| JKL Furnishings Ltd | Wholesale & retail | 2025 |
| JKL Productions Limited | Arts & recreation | 2013 |
| JKN Commercial Limited | Real estate | 2024 |
| JKN Renewables Ltd. | Construction | 2012 |
| JKP Detailing Ltd | Administrative & support | 2022 |
| Jkrss Limited | Health & social care | 2014 |
| JKT Portfolio Limited | Real estate | 2023 |
| JKW Hospitality Holdings Ltd | Financial services | 2025 |
| Jkww Ltd | Real estate | 2019 |
| JL Balkanik Food Ltd | Hospitality | 2019 |
| JL Home Investments Ltd | Real estate | 2026 |
| JL Solar Ltd | Construction | 2020 |
| JL Window Cleaning Limited | Administrative & support | 2025 |
| Jl's Soft Ice Cream Ltd | Hospitality | 2021 |
| Jlap Technologies Ltd | Information & communication | 2020 |
| JLB Central Ltd | Wholesale & retail | 2021 |
| Jlew Group Ltd | Wholesale & retail | 2023 |
| Jlitvinas Limited | Transport & logistics | 2025 |
| JLO Group Limited | Financial services | 2021 |
| JLP Brands Ltd | Wholesale & retail | 2024 |
| Jlpm Consultancy Limited | Professional & scientific | 2025 |
| JLR Properties (Yorkshire) Ltd | Construction | 2023 |
| JLR Renovations Ltd | Construction | 2017 |
| Jlraas Holding Limited | Financial services | 2023 |
| JLS Electrical Solutions Ltd | Construction | 2023 |
| JLT Comms Limited | Transport & logistics | 2021 |
| JM Access Management Ltd | Construction | 2015 |
| JM Innovations Ltd | Information & communication | 2026 |
| JM Property Law Limited | Professional & scientific | 2022 |
| JM Ultrasound Services Limited | Health & social care | 2024 |
| JM2 Rental Ltd | Transport & logistics | 2023 |
| JMA Design and Build Ltd | Construction | 2026 |
| JMB Developments Ltd | Construction | 2017 |
| JMB Rigging Ltd | Information & communication | 2021 |
| JMC Trans Ltd | Transport & logistics | 2015 |
| JME Care Ltd | Health & social care | 2011 |
| JMF Cooling Ltd | Professional & scientific | 2026 |
| JMG Beheer Ltd | Other services | 2008 |
| JMG Brokers Ltd | Financial services | 2023 |
| JMG Letting Ltd | Households | 2026 |
| JMG Properties (Doncaster) Ltd | Real estate | 2018 |
| JMG Roofing Solutions Limited | Construction | 2026 |
| JMH Estates Ltd | Real estate | 2022 |
| JMH Lettings Ltd | Administrative & support | 2020 |
| JMH Rail Limited | Administrative & support | 2015 |
| JMI Real Estate Limited | Real estate | 2021 |
| JML Engineering Services Limited | Manufacturing | 2015 |
| JMN Property Solutions Limited | Construction | 2012 |
| Jmodirect Limited | Wholesale & retail | 2025 |
| JMP Consultancy Services Limited | Professional & scientific | 2015 |
| JMP Doncaster Ltd | Financial services | 2022 |
| JMS Kubik Ltd | Transport & logistics | 2024 |
| JMS Language of Business Ltd | Education | 2015 |
| JMS Mechanical Services (Yorkshire) Ltd | Construction | 2012 |
| JMS of Doncaster (Holdings) Limited | Financial services | 2014 |
| JMS of Doncaster Holdings 2022 Limited | Financial services | 2022 |
| JMS of Doncaster Limited | Transport & logistics | 2001 |
| JMS of Doncaster Property Holdings Limited | Financial services | 2022 |