| JRI Associates Limited | Professional & scientific | 2025 |
| JRK Group Ltd | Transport & logistics | 2020 |
| Jrma Salons Ltd | Other services | 2008 |
| Jrrs Properties Limited | Real estate | 2017 |
| JRS Construction Limited | Construction | 2025 |
| JS Guards Ltd | Administrative & support | 2026 |
| JS Screeding Ltd | Construction | 2019 |
| JS Toor Ltd | Construction | 2025 |
| Jscammell Ltd | Wholesale & retail | 2024 |
| JSJ Contract Ltd | Construction | 2026 |
| JSK Electrical Services Ltd | Construction | 2020 |
| JSL Scaffolding Ltd | Construction | 2024 |
| JST Carpentry Ltd | Construction | 2015 |
| JSZ Ltd | Health & social care | 2015 |
| JT Trade Services Ltd | Construction | 2019 |
| Jt&D Property Limited | Real estate | 2022 |
| JTC Electrical Engineers Limited | Construction | 2017 |
| Jthristars & Co Limited | Extraterritorial | 2020 |
| JTM Accounting & Taxation Services Limited | Professional & scientific | 2026 |
| Juana Group Limited | Wholesale & retail | 2022 |
| Jubilee Shop Fronts & Shutters Ltd | Manufacturing | 2019 |
| Jubilee Shutters and Shopfront Limited | Manufacturing | 2026 |
| Jude Top Class Barber Limited | Administrative & support | 2017 |
| Jugnoo of London Ltd | Wholesale & retail | 2025 |
| Juice Cafe Ltd | Hospitality | 2026 |
| Julat Consultancy Ltd | Professional & scientific | 2016 |
| Julian Hall Limited | Professional & scientific | 2011 |
| JULIMAN2 Limited | Health & social care | 2020 |
| Jummy Cosmix Skin Care Ltd | Wholesale & retail | 2024 |
| Jumpacre Limited | Extraterritorial | 2024 |
| Jumsol Global Ventures Ltd | Wholesale & retail | 2018 |
| Juno E-Commerce Services Ltd | Professional & scientific | 2025 |
| Junyor Construction Ltd | Construction | 2012 |
| Jurgi Helper Ltd | Administrative & support | 2025 |
| Just Blooms Enterprise | Wholesale & retail | 2017 |
| Just Blooms Ltd | Real estate | 2020 |
| Just Cool NOW Ltd | Manufacturing | 2025 |
| Just Dryclean Ltd | Extraterritorial | 2017 |
| Just Electricals Ltd | Energy | 2018 |
| Just Give Back UK Ltd | Administrative & support | 2021 |
| Just Lawson (UK ) Limited | Professional & scientific | 2012 |
| Just Maintenance London Limited | Other services | 2016 |
| Justas Services Ltd. | Construction | 2017 |
| Justinpat Limited | Health & social care | 2022 |
| Justshadesldn Ltd | Wholesale & retail | 2026 |
| Juttap Ltd | Wholesale & retail | 2011 |
| JVU Construction Ltd | Construction | 2025 |
| JXT Electrical Services Limited | Construction | 2015 |
| JZ Furniture Ltd | Wholesale & retail | 2021 |
| JZ Utilities Ltd | Construction | 2018 |
| K & M Properties Investment Limited | Real estate | 2025 |
| K & M Property Service Ltd | Construction | 2023 |
| K & N Management Services Ltd | Professional & scientific | 2023 |
| K & S Quality Ltd | Construction | 2014 |
| K a Frempong Ltd | Construction | 2013 |
| K Ahad Law Point Ltd | Professional & scientific | 2024 |
| K Catering Ltd | Hospitality | 2026 |
| K David Ltd | Information & communication | 2018 |
| K K Food and Juice Ltd | Hospitality | 2026 |
| K K Shop Front Shutters Ltd | Construction | 2022 |
| K Maestro Ltd | Water & waste | 2020 |
| K Mcglinchey Limited | Construction | 2016 |
| K N Home Store Ltd | Wholesale & retail | 2025 |
| K S J Plumbing and Electrical Limited | Construction | 2025 |
| K&M Cleaners Ltd | Administrative & support | 2019 |
| K&M Drylining Limited | Construction | 2018 |
| K&N Business Services Ltd | Water & waste | 2014 |
| K&R Brilliant Cleaning Limited | Administrative & support | 2022 |
| K&S Building Ltd | Construction | 2025 |
| K. & D. Joinery Limited | Manufacturing | 2001 |
| K. Smart Transportation Ltd | Transport & logistics | 2019 |
| K.K Autos London Ltd | Wholesale & retail | 2022 |
| K.P. Freight Services Ltd | Transport & logistics | 2011 |
| K2 Landscaping Limited | Professional & scientific | 2021 |
| K77STAN Limited | Transport & logistics | 2011 |
| KA Rental Cars Ltd | Administrative & support | 2024 |
| Kaada Limited | Wholesale & retail | 2025 |
| Kabasentertainament Ltd | Hospitality | 2025 |
| Kads Cloud Ltd | Information & communication | 2019 |
| Kafgeer Ltd | Manufacturing | 2025 |
| Kahnur Trading Ltd | Wholesale & retail | 2019 |
| Kaim Khani Brothers Ltd | Hospitality | 2019 |
| Kajier Manjaku United-Uk Ltd | Other services | 2018 |
| Kaku Properties Ltd | Real estate | 2024 |
| Kakumei Studios Ltd. | Arts & recreation | 2014 |
| Kalala and Siblings Ltd | Health & social care | 2017 |
| Kalhana Collections UK Ltd | Wholesale & retail | 2015 |
| Kalisi Capital Ltd | Construction | 2025 |
| Kalwar Limited | Wholesale & retail | 2023 |
| Kalyar Movers Ltd | Transport & logistics | 2025 |
| Kambilt Convenience Store Limited | Wholesale & retail | 2021 |
| Kamgrove Enterprises Limited | Construction | 2002 |
| Kami NI Shinjiru Limited | Hospitality | 2025 |
| Kaminski Project Limited | Construction | 2025 |
| Kamkaa Limited | Health & social care | 2018 |
| KAN IT and Business Solutions Limited | Information & communication | 2015 |
| KAN Transport Ltd | Transport & logistics | 2024 |
| Kandai Enterprises Ltd | Wholesale & retail | 2026 |
| Kande Apparel & Accessories Ltd | Wholesale & retail | 2024 |
| Kandib Ltd | Manufacturing | 2018 |