| JPC Property Development Ltd | Real estate | 2012 |
| JPD Management Limited | Professional & scientific | 2011 |
| Jpmm Properties Ltd | Financial services | 2017 |
| JPN Management Ltd | Real estate | 2017 |
| JPO Motors Ltd | Wholesale & retail | 2024 |
| JPV Data Smart Consultants Limited | Information & communication | 2019 |
| Jqcp Limited | Administrative & support | 2014 |
| JR Admin Solutions Ltd | Professional & scientific | 2024 |
| JR Ilford Ltd | Wholesale & retail | 2016 |
| JR Photo Limited | Information & communication | 2024 |
| JR UK Estates Ltd | Real estate | 2023 |
| JRB Waste Limited | Water & waste | 2025 |
| JRC Investments (Essex) Ltd | Real estate | 2015 |
| JRE Page Ltd | Health & social care | 2019 |
| Jrec Limited | Administrative & support | 2015 |
| JRF Investments Group Ltd | Real estate | 2025 |
| Jroast & Kitchen Ltd | Hospitality | 2023 |
| JRS Realty Holdings Ltd | Real estate | 2012 |
| JRV Consulting Limited | Financial services | 2014 |
| JRV Corp Ltd | Professional & scientific | 2025 |
| JS Asset Management Ltd | Real estate | 2022 |
| JS Bahia Ltd | Real estate | 2020 |
| JS Cleaning & Removal Services Limited | Transport & logistics | 2023 |
| JS Construction London Ltd | Construction | 2019 |
| JS Construction PVT Ltd | Construction | 2023 |
| JS Developments London Ltd | Real estate | 2022 |
| JS Fashion Ltd | Wholesale & retail | 2026 |
| JS Finance Group Limited | Professional & scientific | 2016 |
| JS Holdings 1 Limited | Real estate | 2021 |
| JS Intertrade Ltd | Wholesale & retail | 2026 |
| JS INVESTMENTS(UK1) Limited | Real estate | 2017 |
| JS Joinery Services Limited | Construction | 2022 |
| JS Kahna Builders Ltd | Construction | 2023 |
| JS London Builders Ltd | Construction | 2025 |
| JS London Leisure Ltd | Hospitality | 2017 |
| JS Shergill Contractors Ltd | Construction | 2020 |
| JS Solan Limited | Construction | 2026 |
| JS Trading (London) Limited | Wholesale & retail | 2018 |
| JSB Builds Ltd | Construction | 2026 |
| JSB Developments Ltd | Real estate | 2019 |
| JSB Practices Ltd | Health & social care | 2025 |
| Jsbrod Limited | Information & communication | 2024 |
| Jscompany Ltd | Wholesale & retail | 2026 |
| Jsemi Limited | Real estate | 2025 |
| Jsemi Properties Limited Liability Partnership | | 2021 |
| Jsew Limited | Construction | 2025 |
| JSG Accountancy Ltd | Professional & scientific | 2003 |
| JSG Learning Consultancy Limited | Education | 2024 |
| JSG Management Consultancy Ltd | Information & communication | 2020 |
| JSK Living Limited | Wholesale & retail | 2025 |
| JSL Medics Ltd | Health & social care | 2021 |
| JSM Builders Limited | Construction | 2018 |
| JSM Food Ltd | Hospitality | 2024 |
| Jsmaa Limited | Health & social care | 2026 |
| Jsmk Patel Limited | Professional & scientific | 2023 |
| JSN Wholesale Ltd | Wholesale & retail | 2023 |
| Jsph Ltd | Construction | 2026 |
| JSR Heritage Ltd | Administrative & support | 2021 |
| JSS Wealth Ltd | Financial services | 2023 |
| JST Donbosco Ltd | Real estate | 2019 |
| Jstv Developments Ltd | Real estate | 2025 |
| JSZ313 Digital Ltd | Information & communication | 2026 |
| JT Solid Surfaces Limited | Construction | 2010 |
| JT Tiling Ltd | Construction | 2025 |
| JTA Commercial Limited | Information & communication | 2025 |
| JTD1 Ltd | Financial services | 2025 |
| JTK Food & Wine Ltd | Wholesale & retail | 2019 |
| Jtpn Holdings Limited | Real estate | 2025 |
| JU Wegner Ltd | Health & social care | 2022 |
| Juba Limited | Real estate | 2020 |
| Jubidoobyvending Ltd | Hospitality | 2025 |
| Jubilant Enterprises Ltd | Construction | 2018 |
| Juddi Connect Ltd | Transport & logistics | 2025 |
| Jude Consultancy Ltd | Professional & scientific | 2013 |
| Judge Property Limited | Real estate | 2020 |
| Judiya Enterprises Ltd | Wholesale & retail | 2010 |
| JUE JUE Ltd | Real estate | 2013 |
| Jugraj Singh Ltd | Construction | 2023 |
| Julia Monaghan Foundation (JMF) | Other services | 2022 |
| Julian Davies Building Design & Management Ltd | Wholesale & retail | 1988 |
| Julian LME Electrical Company Ltd | Energy | 2017 |
| Julia’S BD Collection UK Ltd | Wholesale & retail | 2024 |
| Julius Construction Ltd | Other services | 2021 |
| Julius Services Ltd | Construction | 2019 |
| Julo Property Solutions Limited | Real estate | 2020 |
| Juls Property Investment Ltd | Real estate | 2025 |
| Jumarah Limited | Professional & scientific | 2013 |
| Jump Consulting Ltd | Professional & scientific | 2025 |
| Jump Track Ltd | Wholesale & retail | 2025 |
| Junaid Maroof Ltd | Real estate | 2018 |
| Junaid&M Ltd | Wholesale & retail | 2024 |
| Junaynahlimited Limited | Transport & logistics | 2025 |
| Jungfrau Ltd | Real estate | 2016 |
| Jungle Monkeys Ltd | Education | 2013 |
| Jungli Limited | Hospitality | 2015 |
| Junico House Ltd | Real estate | 2023 |
| Juniper Parts Ltd | Wholesale & retail | 2026 |
| Juodela Ltd | Wholesale & retail | 2024 |
| Jupiter IT Consulting Ltd | Information & communication | 2017 |
| Jupiter Real Estate Management Ltd | Real estate | 2018 |