| JBK Facilities Ltd | Transport & logistics | 2025 |
| JBM Property Services Ltd | Construction | 2018 |
| JBR Gurkha Ltd | Hospitality | 2025 |
| JC Airport Transfers Ltd | Transport & logistics | 2025 |
| JC Autobreakers Ltd | Administrative & support | 2018 |
| JC Developments (HOO) Ltd | Construction | 2025 |
| JC Estimaters Ltd | Other services | 2025 |
| JC Occupational Hygiene Services Limited | Professional & scientific | 2026 |
| JC5 Electrical Limited | Construction | 2026 |
| Jcct Investments Ltd | Real estate | 2024 |
| JCD Cleaning & Support Services Ltd | Administrative & support | 2014 |
| JCF Investments Ltd | Construction | 2014 |
| Jcil Limited | Health & social care | 2013 |
| JCP Heating & GAS Ltd | Construction | 2018 |
| JCR Project Management Limited | Professional & scientific | 2023 |
| JD Services Hvac Limited | Construction | 1999 |
| JD2 Rail Limited | Construction | 2014 |
| JDA International Enterprises Limited | Other services | 2025 |
| Jdfbeauty Ltd | Other services | 2023 |
| JDH Scaffolding Ltd | Extraterritorial | 2015 |
| JDK Fire Ltd | Public administration | 2023 |
| Jdseasonings Limited | Manufacturing | 2016 |
| Jeff Willett Ltd | Construction | 2016 |
| Jeffann Limited | Professional & scientific | 2016 |
| Jefferson Wolfe Ltd | Administrative & support | 2011 |
| Jehovah Evangelical Team (J.E.T) C.C.C Valley of Berachah Parish | Information & communication | 2016 |
| Jelly Inn Ltd | Real estate | 2019 |
| Jenpro Ltd | Wholesale & retail | 1999 |
| Jensen Tilley Limited | Arts & recreation | 2019 |
| Jensen Trading Limited | Wholesale & retail | 2023 |
| Jerez Ltd | Hospitality | 2022 |
| Jerzarie Group Ltd | Transport & logistics | 2023 |
| Jessie & John Healthcare Limited | Health & social care | 2022 |
| JET Ductwork Services Ltd | Energy | 2014 |
| JET TEC Solutions Ltd | Water & waste | 2020 |
| Jethor Ltd | Information & communication | 2026 |
| JEV Services Ltd | Construction | 2016 |
| Jevia Homes Limited | Real estate | 2019 |
| Jewels Necco Education Consultants Limited | Administrative & support | 2015 |
| Jeys Construction Ltd | Construction | 2022 |
| JFG CON & REC Ltd | Other services | 2023 |
| JH Auto Services Ltd | Wholesale & retail | 2016 |
| JH Consulting International Ltd | Professional & scientific | 2021 |
| JH Floors Ltd | Construction | 2025 |
| JH Plastering and Damp Limited | Construction | 2021 |
| JHB Ground Rents Limited | Real estate | 2014 |
| JHB Investments Limited | Construction | 2013 |
| JHG Groundworks Limited | Construction | 2026 |
| Jhkl Investments Ltd | Real estate | 2020 |
| JHS Property Services Ltd | Real estate | 2022 |
| Jhshub Ltd | Wholesale & retail | 2026 |
| JIA Electrical Ltd | Construction | 2024 |
| Jiahe Market Ltd | Wholesale & retail | 2023 |
| Jiateng Limited | Hospitality | 2025 |
| Jibbers Jibbers Limited | Other services | 2015 |
| Jiggy Teenz Ltd | Other services | 2025 |
| Jijelli Quality Ltd | Wholesale & retail | 2026 |
| JIM Griffiths Consulting Ltd | Professional & scientific | 2024 |
| Jimaduff UK Limited | Construction | 2019 |
| Jimbers Security Ltd | Administrative & support | 2025 |
| Jimmyps Ltd | Energy | 2010 |
| Jinan Beyrouth Ltd | Wholesale & retail | 2026 |
| Jingade London Ltd | Wholesale & retail | 2026 |
| JISE3 Limited | Real estate | 2019 |
| Jisodeb Ltd | Health & social care | 2026 |
| Jiyudo IT Services Ltd | Information & communication | 2024 |
| JJ & Co. Homes Ltd | Construction | 2011 |
| JJ Alarms Limited | Construction | 2014 |
| JJ Food Group Ltd | Hospitality | 2013 |
| JJ Health Provider Limited | Health & social care | 2013 |
| JJ Sterling Group Ltd | Real estate | 2025 |
| Jj's of Newington Ltd | Hospitality | 2025 |
| JJB Electrical & Heating Services Ltd | Construction | 2012 |
| JJC Flooring Ltd. | Construction | 2018 |
| JJJ Property Limited | Real estate | 2018 |
| JJW Bookkeeping Services Limited | Professional & scientific | 2019 |
| JK Cooling Maintenance Ltd | Construction | 2026 |
| JKM Estates Ltd | Real estate | 2025 |
| JKO Housing Ltd | Real estate | 2023 |
| Jkool Ltd | Wholesale & retail | 2019 |
| JKP Air Conditioning Ltd | Construction | 2026 |
| JKR Consultancy Limited | Health & social care | 2025 |
| JKS Homes Ltd | Real estate | 2022 |
| JKS Services Management Limited | Health & social care | 2023 |
| JL Barnard Developments Limited | Construction | 2019 |
| JL Mobile Tyres Ltd | Wholesale & retail | 2025 |
| JL2 Ltd | Construction | 2022 |
| JLC Direct Limited | Wholesale & retail | 2025 |
| JLK Lifts Ltd | Manufacturing | 2019 |
| JLLOYDSAMUEL1212 Consulting Limited | Information & communication | 2018 |
| JLT Solutions Limited | Construction | 2022 |
| JLV Technology Limited | Administrative & support | 2018 |
| JM Mortgage & Finance Ltd | Financial services | 2015 |
| JMA Luxury Developments Ltd | Real estate | 2020 |
| JMC Commercial Sales Ltd | Wholesale & retail | 2018 |
| JMD Innovation Limited | Information & communication | 2015 |
| JMH Repairs and Servicing Limited | Manufacturing | 2016 |
| JMJ Property & Construction Ltd. | Real estate | 2020 |
| Jmjones Services Limited | Administrative & support | 2025 |
| JMK Drinks Limited | Hospitality | 2019 |