| JH Logistics Services Ltd | Transport & logistics | 2026 |
| JHA Limited | Health & social care | 2021 |
| Jhaf Limited | Health & social care | 2024 |
| Jhco Development Ltd | Real estate | 2019 |
| JHL Film Services Limited | Arts & recreation | 2018 |
| JHM TAI Limited | Information & communication | 2024 |
| JHW Solutions Limited | Information & communication | 2014 |
| Jianyproperty Limited | Real estate | 2017 |
| Jibreel App Ltd | Information & communication | 2024 |
| Jibrl Logistics Limited | Transport & logistics | 2026 |
| Jigsaw CS Ltd | Professional & scientific | 2025 |
| JIM and SUF Ltd | Hospitality | 2023 |
| Jimmy & Brothers Ltd | Transport & logistics | 2020 |
| Jinli Ltd | Administrative & support | 2017 |
| Jiyansh Ltd | Wholesale & retail | 2024 |
| JJ Fussey Limited | Professional & scientific | 2023 |
| JJ Lofts & Extensions Ltd | Construction | 2025 |
| JJ Luxury Transfers Ltd | Transport & logistics | 2026 |
| JJ Tiling Ltd | Construction | 2022 |
| JJB Traffic Management Ltd | Professional & scientific | 2022 |
| JJC Roofing & Building Ltd | Construction | 2025 |
| JJK Investment Properties Limited | Real estate | 2021 |
| JJP Group Holdings Ltd | Construction | 2019 |
| JJR Management Ltd | Real estate | 2019 |
| JK Asset Management Services Ltd | Real estate | 2025 |
| JK Construction & Brickwork Ltd | Construction | 2022 |
| JK Scenic Limited | Construction | 2019 |
| JKR Aulakh Properties Ltd | Real estate | 2024 |
| JL Property Investors Ltd | Real estate | 2026 |
| JLB Investments North Ltd | Construction | 2023 |
| JLJ Building Services Ltd | Construction | 2014 |
| JLS Rigging Ltd | Professional & scientific | 2011 |
| JM Solutions UK Limited | Wholesale & retail | 2007 |
| JM Werner Ltd | Health & social care | 2019 |
| JMBS4 Ltd | Transport & logistics | 2025 |
| JMD Services UK Limited | Administrative & support | 2009 |
| JMG Logistics Ltd | Transport & logistics | 2025 |
| JMG Vata Construction Ltd | Construction | 2021 |
| JMG1 Ltd | Health & social care | 2024 |
| JMK Business Solutions Limited | Administrative & support | 2009 |
| JMK Finance Limited | Financial services | 2017 |
| JMK Group UK Ltd | Professional & scientific | 2007 |
| JMK Professional Services Limited | Professional & scientific | 2013 |
| Jmtk Limited | Real estate | 2021 |
| JN Transport Limited | Other services | 2021 |
| JNC Advisory Ltd | Professional & scientific | 2026 |
| Jnel Ltd | Construction | 2025 |
| JNJ Power Engineering Ltd | Professional & scientific | 2025 |
| JNM Stratify Limited | Professional & scientific | 2025 |
| Jnsg Limited | Hospitality | 2021 |
| JNT Tech Ltd | Information & communication | 2023 |
| Joap Ltd | Education | 2024 |
| Jocenti Services Ltd | Professional & scientific | 2020 |
| Joemp Limited | Wholesale & retail | 2025 |
| Joga Bonito Football Club Ltd | Arts & recreation | 2020 |
| John 1 Burrows Ltd | Extraterritorial | 2023 |
| John Rigg Haulage Limited | Transport & logistics | 2009 |
| John Street Holding Ltd | Real estate | 2026 |
| John Street Property Ltd | Real estate | 2020 |
| John Sweeney Holdings Limited | Financial services | 2021 |
| Jojobi Ltd | Real estate | 2020 |
| Jomas Associates Ltd | Professional & scientific | 2009 |
| Jomas Engineering Group Limited | Financial services | 2025 |
| Jomas Remediation Limited | Water & waste | 2020 |
| JON Lloyd and Sons Limited | Construction | 2018 |
| Jonathan P Burrows Ltd | Extraterritorial | 2023 |
| Jonathan Parr Consulting Ltd | Other services | 2016 |
| Jondo Sports UK Limited | Wholesale & retail | 2024 |
| Jones Property Associates LLP | | 2008 |
| JOO Services Limited | Information & communication | 2015 |
| Jordan Anais Ltd | Professional & scientific | 2025 |
| Jortan Ltd | Wholesale & retail | 2026 |
| Joseph Electrics Ltd | Construction | 2024 |
| Joshi Ltd | Information & communication | 2024 |
| Jossa 83 Ltd | Transport & logistics | 2021 |
| Joulabs Ltd | Information & communication | 2026 |
| Joy Travel Limited | Information & communication | 1976 |
| Joyful Living Centre Limited | Health & social care | 2025 |
| Joyque Limited | Information & communication | 2011 |
| JP and BA Ohara Ltd | Real estate | 2024 |
| JP Bridgeford Point Ltd | Real estate | 2019 |
| JPA Connect Ltd | Real estate | 2019 |
| JPB Accounting Limited | Professional & scientific | 2022 |
| JPH Catering Ltd | Hospitality | 2011 |
| JR Food and Wine Limited | Wholesale & retail | 2019 |
| JR John Group Ltd | Other services | 2023 |
| JR Scenic Design Limited | Information & communication | 2022 |
| JR Uxbridge Ltd | Hospitality | 2017 |
| Jr&C Limited | Health & social care | 2023 |
| Jrogers Constructions Limited | Construction | 2025 |
| JRS Autos Ltd | Wholesale & retail | 2024 |
| JRS Consultants ( PVT) Ltd | Information & communication | 2023 |
| JS & BH Ltd | Transport & logistics | 2023 |
| JS & ZZ Trading Ltd | Wholesale & retail | 2025 |
| JS Autovault Ltd | Transport & logistics | 2026 |
| JS Fast Foods Ltd | Hospitality | 2017 |
| JS Fresh Foods Ltd | Hospitality | 2016 |
| JS GAS Limited | Construction | 2024 |
| JS IT Consultancy Limited | Information & communication | 2016 |
| JS Marquee Ltd | Arts & recreation | 2021 |