| JIK Corporation Ltd | Health & social care | 2014 |
| Jingila Ltd | Wholesale & retail | 2025 |
| Jitank Limited | Professional & scientific | 2008 |
| Jitshri Limited | Other services | 2015 |
| Jiva Essentials Ltd | Administrative & support | 2016 |
| JJ Electrical Installs Ltd | Construction | 2023 |
| JK Accounting Ltd | Professional & scientific | 2014 |
| JK Fakhory Ltd | Real estate | 2024 |
| JK Fenix Ltd | Transport & logistics | 2013 |
| Jkpl Wholesale Ltd | Extraterritorial | 2025 |
| Jlabrickwork Ltd | Construction | 2021 |
| JLL Holdings Limited | Real estate | 2020 |
| JM Help Limited | Construction | 2024 |
| Jmax Trading Limited | Wholesale & retail | 2019 |
| JMD Recruitment Limited | Administrative & support | 2021 |
| Jmds Holdings Limited | Other services | 2025 |
| JME Counselling Ltd | Professional & scientific | 2022 |
| JMS Tippers Limited | Water & waste | 2015 |
| JMW Portfolio Ltd | Financial services | 2022 |
| JNA Chartered Architects Ltd | Professional & scientific | 2019 |
| JNE Home Improvements Ltd | Construction | 2022 |
| Jnpr Aero Limited | Financial services | 2025 |
| JNS Professionals Limited | Health & social care | 2012 |
| JO & Clive Accountants Limited | Professional & scientific | 2023 |
| Jo's Creature Comforts Ltd | Other services | 2016 |
| JO23 Property Ltd | Real estate | 2020 |
| Joanne Tree Educational Psychology Limited | Health & social care | 2023 |
| JOB Connections (UK) Limited | Professional & scientific | 2002 |
| Jochebed Publishing Ltd | Information & communication | 2025 |
| Joeblessed Housing Solutions Ltd | Real estate | 2026 |
| John Builder Improvements Ltd | Construction | 2024 |
| John Jempson & SON Limited | Transport & logistics | 2024 |
| Johnson & Sons Limited | Construction | 2010 |
| Joint Ventures Group Ltd | Administrative & support | 2025 |
| Jokers Interprise Limited | Health & social care | 2025 |
| JON Otter Consulting Ltd | Professional & scientific | 2015 |
| Jonell Trans Ltd | Transport & logistics | 2023 |
| Jones Audio Solutions Ltd | Arts & recreation | 2025 |
| Joneshaus Ltd | Real estate | 2025 |
| Jordan’S Haulage and Freight Ltd | Transport & logistics | 2024 |
| Josaiah Ltd | Health & social care | 2018 |
| Joseph Giles Limited | Wholesale & retail | 2013 |
| Joseph James & Sons Limited | Extraterritorial | 2021 |
| Josephine Dolly Limited | Health & social care | 2024 |
| Josh Commercial Services Ltd | Professional & scientific | 2018 |
| Josh Dylan Limited | Real estate | 2020 |
| Josoye Limited | Information & communication | 2012 |
| Jounell Air Services Limited | Administrative & support | 2017 |
| JP Electrical and Building Ltd | Construction | 2019 |
| JP Lofts and More Ltd | Construction | 2026 |
| JPW Aviation Consultants Limited | Professional & scientific | 2013 |
| JRB Healthcare Limited | Health & social care | 2018 |
| JRM Logistical Services Limited | Administrative & support | 2014 |
| JRS Cars Ltd | Transport & logistics | 2025 |
| JS Arrow Logistics Ltd | Transport & logistics | 2026 |
| JS Civil Engineering Ltd | Professional & scientific | 2025 |
| JS Cleaning Solutions Limited | Administrative & support | 2023 |
| JS Concrete Pumping Ltd | Construction | 2020 |
| JS Records Ltd | Arts & recreation | 2026 |
| JSJ Drywall & Plastering Contractors Limited | Construction | 2017 |
| JSK Electrical Wholesalers & Distributors Limited | Wholesale & retail | 2011 |
| JSS Security Ltd | Administrative & support | 2025 |
| Jssc Investments Limited | Real estate | 2024 |
| JSY Legal Consultants Ltd | Professional & scientific | 2022 |
| JT Coaching & Consulting Limited | Professional & scientific | 2017 |
| JT Handyman Services Limited | Administrative & support | 2025 |
| JT Lashes Limited | Other services | 2024 |
| JTH Building Solutions Ltd | Construction | 2026 |
| Juaninamillion Solutions Ltd | Financial services | 2021 |
| Juara IT Solutions UK Limited | Information & communication | 2019 |
| Julia Cosmetics Ltd | Health & social care | 2015 |
| Juliet Tango Ltd | Agriculture & fishing | 2022 |
| Junius Limited | Arts & recreation | 1990 |
| Junkeys Ltd | Water & waste | 2024 |
| Jupp Landscapes Ltd | Administrative & support | 2025 |
| Jurisverse Ltd | Professional & scientific | 2023 |
| Jurjon Consulting Ltd | Administrative & support | 2019 |
| Just Beauty Shop Limited | Wholesale & retail | 2024 |
| Just Mechanics (Crawley) Ltd | Wholesale & retail | 2008 |
| Just Resist Ltd | Wholesale & retail | 2023 |
| Just Tish Ltd | Construction | 2026 |
| Justboxfit Academy Ltd | Arts & recreation | 2026 |
| Justin Dolly Ltd | Construction | 2022 |
| JV Couriers Ltd | Transport & logistics | 2023 |
| JV Global Resource Ltd | Manufacturing | 2025 |
| JV Partners Ltd | Construction | 2025 |
| JW Heating Solutions Ltd | Construction | 2023 |
| JW Nampala Consultancy Limited | Professional & scientific | 2019 |
| JWK Electrical Services Ltd | Construction | 2021 |
| Jwlc Property Limited | Real estate | 2021 |
| K F Medical Services Ltd | Health & social care | 2024 |
| K R Caterers Ltd | Manufacturing | 2024 |
| K&C Removal and Cleaning Services Ltd | Transport & logistics | 2026 |
| K&K Property Solutions Ltd | Real estate | 2023 |
| K&N Express Ltd | Transport & logistics | 2020 |
| K&R Consulting Services Ltd | Professional & scientific | 2026 |
| K&U United Enterprise Ltd | Wholesale & retail | 2024 |
| K'S Cabinets Ltd | Manufacturing | 2024 |
| K-Net A-Baarakah Media Ltd | Wholesale & retail | 2026 |
| K.L.T.Construction Ltd | Construction | 2020 |