| Joga Jeezy Ltd | Arts & recreation | 2025 |
| Jogasingh Ltd | Construction | 2026 |
| Joginder Singh Construction Limited | Construction | 2021 |
| Johal Home Property Limited | Administrative & support | 2026 |
| Johal Homes Limited | Real estate | 2021 |
| John Theo Traders Ltd | Professional & scientific | 2024 |
| Johnson Street Management Company Limited | Other services | 2006 |
| Joint Investment Power Limited | Real estate | 2015 |
| Joney Digital Studio UK Ltd | Professional & scientific | 2023 |
| Jorawar Singh Ltd | Construction | 2025 |
| Jorgis Accountants Ltd | Professional & scientific | 2011 |
| Josan Roofing London Ltd | Construction | 2023 |
| Jose Consulting U.K Ltd | Mining & quarrying | 2019 |
| Jose Foundation | Other services | 2017 |
| Josh DO Ltd | Real estate | 2025 |
| Josh Lawsons Limited | Real estate | 2018 |
| Jossan Roofing Ltd | Construction | 2024 |
| JOT Builds Ltd | Construction | 2025 |
| JOT Essentials Limited | Wholesale & retail | 2024 |
| JOT Property Ltd | Real estate | 2019 |
| Journey to Life Limited | Professional & scientific | 2025 |
| JP Enterprises Ltd | Wholesale & retail | 2017 |
| JP Food Distributors Ltd | Wholesale & retail | 2026 |
| JP Global Wealth Management Ltd | Professional & scientific | 2014 |
| JPJ Group Services Limited | Transport & logistics | 2018 |
| JPS4 Ltd | Construction | 2025 |
| JR 1 Solutions Limited | Extraterritorial | 2012 |
| JR Jassal Builders Limited | Construction | 2015 |
| JR Lifestyle Ltd | Wholesale & retail | 2024 |
| JRR 4 Limited | Real estate | 2021 |
| JRS Investments Limited | Real estate | 2003 |
| JRS Jewellers Limited | Wholesale & retail | 2013 |
| JRS Woodworks Design Ltd | Manufacturing | 2020 |
| JS Ahuja Ltd | Wholesale & retail | 2023 |
| JS Biomedical Ltd | Wholesale & retail | 2019 |
| JS Bull Limited | Construction | 2025 |
| JS Corp Ltd | Construction | 2021 |
| JS Demolation Ltd | Construction | 2025 |
| JS Enterprises (UK) Ltd | Wholesale & retail | 2013 |
| JS Realty Ltd | Real estate | 2019 |
| JS Saini Ltd | Construction | 2026 |
| JS Surveying Services Ltd | Professional & scientific | 2025 |
| JS Unity Ltd | Wholesale & retail | 2026 |
| JSB Spirits Limited | Other services | 2014 |
| JSB Welding UK Ltd | Manufacturing | 2021 |
| JSD Home Improvement Ltd | Construction | 2020 |
| JSG Trader Limited | Transport & logistics | 2025 |
| Jsihra Limited | Professional & scientific | 2017 |
| Jsimport&Exports Ltd | Wholesale & retail | 2023 |
| Jsingh Construction Ltd | Construction | 2026 |
| JSK Electrical Contractor Ltd | Construction | 2025 |
| JSK Enterprises Limited | Wholesale & retail | 2025 |
| JSK Financial Consultancy Ltd | Professional & scientific | 2019 |
| JSK Trucking Ltd | Transport & logistics | 2024 |
| JSM 3 Investments Ltd | Real estate | 2026 |
| JSM Enterprises (UK) Limited | Wholesale & retail | 2002 |
| JSM Food&Wine Ltd | Wholesale & retail | 2020 |
| JSM Investors Ltd | Real estate | 2024 |
| JSM Water Ltd | Wholesale & retail | 2025 |
| JSS Recruitment Ltd | Construction | 2025 |
| JST Roofing Ltd | Construction | 2025 |
| Jugaad Mktg Ltd | Professional & scientific | 2025 |
| Jugrajsim Limited | Wholesale & retail | 2025 |
| Juice & Jackets Ltd | Hospitality | 2025 |
| Juices & Shakes Limited | Wholesale & retail | 2019 |
| Julian Lloyd Gordon Ltd | Extraterritorial | 2024 |
| Junaid Jewellers London Limited | Wholesale & retail | 2014 |
| Jupell Limited | Manufacturing | 2025 |
| Just 2 Airports Limited | Transport & logistics | 2018 |
| Just Bite IT Ltd | Hospitality | 2026 |
| Just Engineering Ltd | Construction | 2019 |
| Just Innovative Construction Limited | Construction | 2025 |
| Just One Move Ltd | Real estate | 2022 |
| JUST4BANKS Consultancy Limited | Financial services | 2014 |
| JUST4BANKS Limited | Financial services | 2014 |
| JV Accountants Limited | Professional & scientific | 2017 |
| Jv&Co Limited | Real estate | 2020 |
| JVS DA Builders Ltd | Construction | 2023 |
| JVS DA Developers Ltd | Real estate | 2023 |
| JVT Group Limited | Real estate | 2025 |
| Jyot Kitchens Bedrooms and Constructions Limited | Construction | 2019 |
| Jyot Properties Ltd | Real estate | 2026 |
| K & I Property Investments Ltd. | Real estate | 2016 |
| K and G Metro Ltd | Wholesale & retail | 2020 |
| K Construction Services Ltd | Construction | 2025 |
| K D Promo Services Ltd | Administrative & support | 2026 |
| K Education Centre Ltd | Education | 2020 |
| K Gohil Limited | Health & social care | 2007 |
| K K M Kala Limited | Wholesale & retail | 2024 |
| K Kohli Properties Ltd | Real estate | 2026 |
| K M B Caterers Limited | Manufacturing | 1991 |
| K M Food & Wine Limited | Wholesale & retail | 2020 |
| K Retallack Plumbing and Drainage Ltd | Construction | 2025 |
| K S Gahra Builders Ltd | Construction | 2012 |
| K S Investment Properties Ltd | Real estate | 2025 |
| K Virdi Construction Ltd | Construction | 2025 |
| K&A Capital Group Ltd | Wholesale & retail | 2025 |
| K&A Fast Transport Ltd | Transport & logistics | 2023 |
| K&B Maintenance Ltd | Construction | 2022 |
| K&B Southall Ltd | Hospitality | 2015 |