| Joyful Oils Limited | Manufacturing | 2025 |
| JP Consultants (London) Limited | Other services | 2009 |
| JP Estates Group Limited | Real estate | 2026 |
| JP Infinity Estates Ltd | Real estate | 2025 |
| JP Infinity Property Ltd | Administrative & support | 2023 |
| Jp&S Investment Ltd | Real estate | 2020 |
| JPL Pharma Consulting Ltd | Professional & scientific | 2023 |
| Jppp Limited | Health & social care | 2026 |
| Jpvp Consulting Limited | Professional & scientific | 2020 |
| JPX Holding Ltd | Financial services | 2025 |
| Jp’S Wholesale Ltd | Wholesale & retail | 2026 |
| Jqnova Limited | Wholesale & retail | 2023 |
| JR & JR Services Ltd | Construction | 2025 |
| JRT Biometric Solutions Limited | Information & communication | 2025 |
| JRT Tech Ltd | Wholesale & retail | 2024 |
| JS Jack Ltd | Construction | 2017 |
| Js.Finds Ltd | Wholesale & retail | 2025 |
| JSD Property Limited | Real estate | 2025 |
| Jsecommerce Ltd | Wholesale & retail | 2025 |
| Jsfs Transport Ltd | Transport & logistics | 2026 |
| Jsglobaloperations Ltd | Construction | 2023 |
| Jsjd Properties Limited | Real estate | 2024 |
| JSK Bars Limited | Administrative & support | 2007 |
| JSK Cleaning Limited | Extraterritorial | 2008 |
| JSK Precision Tools Limited | Wholesale & retail | 2018 |
| JSM IT Solution Ltd | Information & communication | 2023 |
| Jsrs Private Limited | Wholesale & retail | 2020 |
| JSS Impex Limited | Wholesale & retail | 2024 |
| JST Care Limited | Health & social care | 2017 |
| Jsta UK LLP | | 2023 |
| JSV Driving Academy Ltd | Education | 2023 |
| Jtx-Security Ltd | Construction | 2021 |
| Jucan Interiors Ltd | Construction | 2021 |
| Jucco Ltd | Other services | 2015 |
| Judo MDA | Professional & scientific | 2012 |
| Juke Commerce Co., Ltd | Wholesale & retail | 2021 |
| Julie Morris Ltd | Professional & scientific | 2020 |
| Juna Investments Limited | Real estate | 2022 |
| Junerose Trading Limited | Wholesale & retail | 2001 |
| Junior Interiors (UK) Limited | Construction | 2005 |
| Junior Property Investments Ltd | Real estate | 2018 |
| Juntech IT Solutions Ltd | Information & communication | 2016 |
| Jupiter Real Estate Ltd | Real estate | 2025 |
| Jureschi Trans Ltd | Transport & logistics | 2019 |
| Juriscorp Limited | Administrative & support | 2025 |
| JUS DE Fruits Ltd | Hospitality | 2025 |
| Just Car Ltd | Professional & scientific | 2023 |
| Just Ebuy IT NOW Ltd | Wholesale & retail | 2025 |
| Just Green Organic UK Limited | Wholesale & retail | 2022 |
| Just Halal Ltd | Wholesale & retail | 2019 |
| Just Imagine Dance Ltd | Education | 2018 |
| Just LET HER Speak Limited | Wholesale & retail | 2018 |
| Just Relax Ltd | Administrative & support | 2024 |
| Justice for Litigants in Person Trust Ltd | Administrative & support | 2011 |
| Justmend Limited | Other services | 2019 |
| JV & JV Limited | Wholesale & retail | 2022 |
| JV Cash and Carry Limited | Wholesale & retail | 2024 |
| JV Propco Ltd | Construction | 2017 |
| Jvdc Capital Limited | Real estate | 2023 |
| JVP Surgery Limited | Health & social care | 2011 |
| Jvsa Property Trading Ltd | Real estate | 2016 |
| JWV Investments Ltd | Wholesale & retail | 2025 |
| JYG Construction Ltd | Construction | 2024 |
| Jyotdeep Limited | Health & social care | 2019 |
| K & a Trading Ltd | Other services | 2011 |
| K & J Products Ltd | Administrative & support | 2025 |
| K & K Builders Limited | Construction | 1984 |
| K & K Express Goods Ltd. | Wholesale & retail | 2016 |
| K & S Dental Limited | Health & social care | 2024 |
| K & S Foods Ltd | Wholesale & retail | 2018 |
| K and K Online Ltd | Wholesale & retail | 2024 |
| K and Sons Recruitment Services Ltd | Administrative & support | 2025 |
| K B Wires Limited | Construction | 2019 |
| K Gold Limited | Wholesale & retail | 2020 |
| K K Import Export Ltd | Administrative & support | 2022 |
| K K Properties (UK) Limited | Construction | 2014 |
| K Maria Beauty Ltd | Wholesale & retail | 2013 |
| K P Engineering Works Limited | Manufacturing | 2004 |
| K P Estates Limited | Real estate | 2012 |
| K Patel Locum Limited | Health & social care | 2025 |
| K Prime Maintenance Ltd | Construction | 2023 |
| K R Cafe Ltd | Hospitality | 2022 |
| K Silhouette Ltd | Health & social care | 2025 |
| K&A Homes Ltd | Construction | 2025 |
| K&D Hirani Limited | Real estate | 2025 |
| K&D Logics Ltd | Wholesale & retail | 2022 |
| K&Joy Ltd | Financial services | 2024 |
| K&S Improvement Ltd | Construction | 2019 |
| K&V Property Management Ltd | Real estate | 2022 |
| K&Z Cars Ltd | Wholesale & retail | 2022 |
| K-Com System (International) Ltd | Information & communication | 2002 |
| K. Maksons Limited | Manufacturing | 2006 |
| K.A.Patel Transport Ltd | Transport & logistics | 2025 |
| K.D. Jewels Limited | Wholesale & retail | 1983 |
| K.M Construction Project Ltd | Construction | 2022 |
| K2 Glazers Ltd | Construction | 2019 |
| K2 Realty Ltd | Real estate | 2026 |
| K9 Exclusive Walks Ltd | Other services | 2022 |
| K9 Knights Security Ltd | Administrative & support | 2016 |
| KA Jewellers Limited | Wholesale & retail | 2024 |