| Jigsaw Lucid Management Ltd | Professional & scientific | 2017 |
| Jihm Ltd | Health & social care | 2026 |
| JIN MAN Limited | Hospitality | 2019 |
| JIS Consultancy Limited | Professional & scientific | 2023 |
| JIT Property Limited | Real estate | 2019 |
| JJ Consultancy Services Ltd | Information & communication | 2006 |
| JJ Football Coaching Ltd | Education | 2022 |
| JJ Signature Properties Ltd | Real estate | 2026 |
| JJF Limited | Construction | 2005 |
| JJF Midlands Holdings Limited | Financial services | 2024 |
| JJF Midlands Ltd | Construction | 2017 |
| JJH Bathrooms & Tiling Ltd | Construction | 2022 |
| JJM Stock Ltd | Real estate | 2020 |
| JJP Property Group Ltd | Real estate | 2025 |
| JK File Solutions Ltd | Administrative & support | 2024 |
| JK Property E Ltd | Real estate | 2025 |
| JKD Consultancy Services Ltd | Construction | 2020 |
| JKH Premiair Limited | Construction | 2005 |
| JKR Management Limited | Real estate | 2019 |
| JKS Projects Limited | Construction | 2023 |
| JLB Mechanics Ltd | Wholesale & retail | 2018 |
| JLC IT Solutions Limited | Information & communication | 2017 |
| JLD Automation Limited | Manufacturing | 2012 |
| JLE Investments Limited | Real estate | 2018 |
| JLH Holdings Limited | Real estate | 2017 |
| Jliv Property Limited | Real estate | 2021 |
| JLS Projects Ltd | Construction | 2020 |
| JMA Visionary Enterprises Ltd | Wholesale & retail | 2019 |
| Jman Property Limited | Real estate | 2021 |
| Jmarutishreeram Ltd | Real estate | 2025 |
| Jmat Management Ltd | Information & communication | 2022 |
| Jmat Property Investments Limited | Real estate | 2025 |
| Jmbd Limited | Manufacturing | 2024 |
| JMC Car Hire Ltd | Administrative & support | 2026 |
| Jmck Properties Limited | Households | 2000 |
| JMH (MM) Limited | Construction | 2023 |
| JMH (WH) Limited | Real estate | 2021 |
| JMH 10 Limited | Construction | 2012 |
| JMJ Developments (UK) Limited | Real estate | 2014 |
| JMP Healthcare Ltd | Health & social care | 2023 |
| Jmsp Investments Ltd | Real estate | 2022 |
| JNH Investments Spain Limited | Real estate | 2015 |
| JNS Drainage Ltd | Water & waste | 2025 |
| JO Tibbins Consulting Ltd | Professional & scientific | 2025 |
| Joanne Sullivan HR Limited | Administrative & support | 2018 |
| Joannou Property Investments Ltd | Real estate | 2021 |
| Jobsyouruncle.Com Limited | Information & communication | 2007 |
| Joch Innovations Ltd | Information & communication | 2017 |
| Jody Marsden Food Safety Consultancy Limited | Professional & scientific | 2024 |
| Joel Makin Property Limited | Real estate | 2020 |
| Joel's Convenience Ltd | Wholesale & retail | 2023 |
| Joespre Healthcare Ltd | Health & social care | 2023 |
| John & William Shering Limited | Extraterritorial | 1985 |
| John Bardgett & Sons,Limited | Extraterritorial | 1935 |
| John Carey Design UK Ltd | Manufacturing | 2022 |
| John Carey Limited | Arts & recreation | 2014 |
| John Court Associates Ltd | Information & communication | 2020 |
| John G.Ashton & Co.(Funeral Directors)Limited | Extraterritorial | 1970 |
| John Knibbs International Limited | Wholesale & retail | 2008 |
| John Russell & Sons (Haulage) Limited | Transport & logistics | 2003 |
| Johnson Funeral Supplies Limited | Extraterritorial | 1964 |
| Johnson Home Developments Ltd | Administrative & support | 2020 |
| Johnson Phoenix Ltd | Real estate | 2024 |
| Johnson-Sears Limited | Extraterritorial | 1983 |
| Johnsons Veterinary Products Limited | Professional & scientific | 1950 |
| Joinex Limited | Manufacturing | 2020 |
| Joja Properties Ltd | Real estate | 2023 |
| Jolly Fryer (KIA) Limited | Hospitality | 2012 |
| Jolson Properties Limited | Administrative & support | 2000 |
| Jomark Capital Limited | Financial services | 2018 |
| Jomco Ltd | Professional & scientific | 2008 |
| Jonathan Hughes Services Ltd | Professional & scientific | 2025 |
| Jonathan MOK Ltd | Households | 2025 |
| Jonathan Walker Funeral Directors Limited | Extraterritorial | 1999 |
| Jonathan Woodall Properties Limited | Real estate | 2021 |
| Jones (Technical Management) Limited | Manufacturing | 2004 |
| Jones and Wilson Limited | Manufacturing | 1989 |
| Jones Family Investment Company Ltd | Real estate | 2014 |
| Jorad Limited | Health & social care | 2019 |
| Jord Home Ltd | Wholesale & retail | 2023 |
| Jordan Estate Planning Limited | Professional & scientific | 2002 |
| Jordan Financial Holdings Ltd | Extraterritorial | 2016 |
| Jordan Financial Management Limited | Financial services | 1998 |
| Joseph Lang Limited | | 1981 |
| Joseph Swift (Funeral Director) Limited | Extraterritorial | 1946 |
| Joseph Tomlinson & Sons Limited | Extraterritorial | 1898 |
| Josh Sephton Consulting Ltd | Professional & scientific | 2024 |
| Joshua Brown Property Limited | Real estate | 2025 |
| Joslin Memorials (1974) Limited | Extraterritorial | 1983 |
| Jostaberry Consulting Limited | Professional & scientific | 2018 |
| Jothaam Havens Ltd | Real estate | 2019 |
| Jovi Properties Ltd | Real estate | 2022 |
| Joy & Peace Limited | Real estate | 2022 |
| JP & HP Holdings Ltd | Financial services | 2024 |
| JP Brickwork & Construction Limited | Construction | 2024 |
| JP Dentalcare Ltd | Health & social care | 2022 |
| JP Foley Pharmacy Limited | Wholesale & retail | 2023 |
| JP Holdings Inc Ltd | Real estate | 2019 |
| JP Motors (Midlands) Limited | Wholesale & retail | 2023 |
| JP Sequence UK Limited | Information & communication | 2015 |