| JRC Ventures Ltd | Hospitality | 2026 |
| Jrlaffiliate Ltd | Professional & scientific | 2024 |
| JS & MT Properties Limited | Real estate | 2013 |
| JS Academy Ltd | Education | 2020 |
| JSA Cars Ltd | Wholesale & retail | 2022 |
| JSA Housing Limited | Real estate | 2022 |
| Jscampbell Electrical Ltd | Construction | 2015 |
| JSM Property Rentals Limited | Real estate | 2025 |
| Jsmith IC Layout Services Ltd | Professional & scientific | 2012 |
| JT Roofing & SON Limited | Construction | 2021 |
| Jtec Electrical Contractors Ltd | Construction | 2025 |
| Jtech Digital Ltd | Information & communication | 2025 |
| Jtech Properties Ltd | Real estate | 2025 |
| JTF Brickwork Ltd | Construction | 2023 |
| JTL Surveying Ltd | Professional & scientific | 2022 |
| JTM Fabrications Ltd | Professional & scientific | 2026 |
| JTV Roofing Ltd | Construction | 2023 |
| Juana Beauty & Wellness Holdings Ltd | Wholesale & retail | 2025 |
| Juicy Lobster Blackpool Ltd | Hospitality | 2025 |
| Julia Glotz Ltd | Information & communication | 2019 |
| Julie Mark Ltd | Hospitality | 2017 |
| Julka D Ltd | Transport & logistics | 2018 |
| Jumoji Control Solutions Ltd | Information & communication | 2017 |
| June International Holdings Limited | Professional & scientific | 2019 |
| Juniors Soft Play and Bouncy Castle Hire Ltd | Households | 2023 |
| Juno IT Consulting Ltd | Information & communication | 2020 |
| Jurassic Earth Ltd | Arts & recreation | 2019 |
| Just Artificial Limited | Wholesale & retail | 2006 |
| Just ASK Travel Limited | Administrative & support | 2016 |
| Just One Room Ltd | Real estate | 2022 |
| Just PM Ltd. | Professional & scientific | 2017 |
| Just Properties Direct Limited | Real estate | 2019 |
| Justgold Limited | Transport & logistics | 1979 |
| Justlaw 24 Limited | Real estate | 2001 |
| JVK Estates Ltd. | Hospitality | 2022 |
| JW Consultants NW Ltd | Real estate | 2023 |
| JWL Doors Limited | Construction | 2020 |
| JY Property Lets Ltd | Real estate | 2020 |
| JYR Property Lets Limited | Real estate | 2021 |
| K & M Pipe Systems Limited | Professional & scientific | 2008 |
| K & S Fire Alarm & PAT Testing Limited | Construction | 2010 |
| K & S PVT Ltd | Wholesale & retail | 2019 |
| K Katz Produce Ltd | Wholesale & retail | 2025 |
| K Mills Property Company Limited | Real estate | 2025 |
| K S B Media Limited | Professional & scientific | 2021 |
| K Smith TM Ltd | Transport & logistics | 2024 |
| K Star Barber Blackpool Ltd | Other services | 2026 |
| K Woodmason Limited | Health & social care | 2015 |
| K&C Bargains Ltd | Wholesale & retail | 2025 |
| K-Artea Limited | Information & communication | 2018 |
| K-Mac Agencies Limited | Wholesale & retail | 2013 |
| K-Ware Limited | Information & communication | 2012 |
| K. Whenmouth Limited | Other services | 2004 |
| K.B. Autos & Sons Limited | Administrative & support | 2015 |
| K.Crowe Properties Limited | Real estate | 2005 |
| K.E.G. Maintenance Services Limited | Construction | 2003 |
| K.Macs’ Mechanicals Ltd | Professional & scientific | 2025 |
| K1 Barbers Blackpool Limited | Other services | 2025 |
| K2 Nutrition UK Limited | Extraterritorial | 2009 |
| K3T Estates Ltd | Real estate | 2023 |
| K3T Ltd | Wholesale & retail | 2023 |
| K9 Breeding and Services Limited | Agriculture & fishing | 2024 |
| Kaa-Global Properties Ltd | Real estate | 2016 |
| Kaa-Solutions Limited | Other services | 2007 |
| KAE Administration Ltd | Real estate | 2023 |
| KAG Building Maintenance Limited | Construction | 2009 |
| Kage IT Solutions Limited | Information & communication | 2021 |
| Kalanjiyamgroups Ltd | Wholesale & retail | 2025 |
| Kaleido Consultancy Ltd | Information & communication | 2019 |
| Kali Transport Ltd | Transport & logistics | 2023 |
| Kalinga Group Ltd | Hospitality | 2015 |
| Kalinga Investments Ltd | Real estate | 2023 |
| KAM Creative Limited | Professional & scientific | 2026 |
| KAM IT Solutions Ltd | Information & communication | 2012 |
| KAM NDT Inspection Limited | Construction | 2014 |
| Kamal&Co Hotel Ltd | Hospitality | 2026 |
| Kamar Holdings Ltd | Wholesale & retail | 2025 |
| Kamm Tech Innovations Ltd | Construction | 2024 |
| Kane Tunnelling (U.K.) Limited | Wholesale & retail | 1987 |
| Kanee Convenience Store Ltd | Wholesale & retail | 2016 |
| Kanteena Events Ltd | Administrative & support | 2025 |
| Kappa Property Investments Limited | Real estate | 2018 |
| Karen Greenwood Management Limited | Professional & scientific | 2017 |
| Karen Wilson Compliance Services Limited | Other services | 2015 |
| Kariz Ventures Ltd | Hospitality | 2023 |
| Karl Greenfarm Ltd | Wholesale & retail | 2025 |
| Karl Smith Car Sales Limited | Wholesale & retail | 2002 |
| Karraz Ltd | Health & social care | 2022 |
| Karta Consultancy Ltd | Professional & scientific | 2019 |
| Kartel Scaffolding Ltd | Construction | 2025 |
| Kashanj Consulting Ltd | Information & communication | 2018 |
| Kasinebi Yachting Ltd | Extraterritorial | 2024 |
| Kasion Accounting Solutions Limited | Professional & scientific | 2018 |
| Kasion Limited | Professional & scientific | 2019 |
| Kaslo Limited | Information & communication | 2014 |
| Kastec Ltd | Wholesale & retail | 2025 |
| Kate Pedler Ltd | Financial services | 2015 |
| Katiksiz Ltd | Hospitality | 2025 |
| Kaur Consulting Limited | Administrative & support | 2007 |
| Kavanagh Utilities Limited | Administrative & support | 2003 |