| Jason Burnside Plumbing & Heating Limited | Construction | 2004 |
| Jason Worsnip Family Funeral Service Limited | Other services | 2017 |
| JB Prop Ltd | Real estate | 2024 |
| JC Capital Group Ltd | Construction | 2001 |
| JC Land (Investments) Ltd | Real estate | 2001 |
| JD Driveways & Landscapes Ltd | Administrative & support | 2026 |
| Jedaprint Ltd | Manufacturing | 2024 |
| Jedi 4X4 Ltd | Wholesale & retail | 2014 |
| Jellyheads AI Ltd | Information & communication | 2025 |
| Jenson Pritchard Motorsport Management Limited | Administrative & support | 2025 |
| JET Freight Ltd | Administrative & support | 2013 |
| Jgtechnical Ltd | Professional & scientific | 2025 |
| JH Masonry Ltd | Construction | 2024 |
| JJ Morris Property Co Ltd | Real estate | 2021 |
| JK Roofing and Home Improvements Ltd | Construction | 2023 |
| Jkkm Properties Ltd | Real estate | 2023 |
| JKS Cleaning Services Ltd | Administrative & support | 2025 |
| JKS Plastic Recycling Ltd | Extraterritorial | 2020 |
| JKS Plastics Ltd | Extraterritorial | 2020 |
| JKS Recycling Ltd | Extraterritorial | 2022 |
| JLB Real Estate Limited | Real estate | 2023 |
| JLC Admin Ltd | Administrative & support | 2026 |
| JLC Rossendale Ltd | Real estate | 2026 |
| JLG Trading Ltd | Wholesale & retail | 2026 |
| JM Home Improvements Rossendale Limited | Professional & scientific | 2025 |
| Jmelam Watches Ltd | Manufacturing | 2020 |
| Jnsbars Ltd | Hospitality | 2024 |
| John David Payne Limited | Professional & scientific | 2022 |
| John Whitaker International Limited | Wholesale & retail | 1998 |
| Jopa IS Limited | Information & communication | 2008 |
| Jordans Building Contractors Limited | Construction | 2004 |
| JP Access Services Ltd | Construction | 2025 |
| JP Promotions Limited | Arts & recreation | 2013 |
| JP Surveying (NW) Ltd | Professional & scientific | 2026 |
| JPH Property Group Ltd | Real estate | 2025 |
| Jpixels Ltd | Information & communication | 2021 |
| JPM Energy Ltd | Construction | 2024 |
| Jpnworld Limited | Wholesale & retail | 2026 |
| JPS Property Services Ltd | Other services | 2019 |
| JR Data Services Ltd | Professional & scientific | 2023 |
| JR Vans Ltd | Wholesale & retail | 2024 |
| Jrostron Ltd | Hospitality | 2025 |
| JS GAS & OIL Ltd | Construction | 2019 |
| Jsbr PM Services Ltd | Professional & scientific | 2025 |
| JT Autos Tools Ltd | Wholesale & retail | 2023 |
| JT Developments (NW) Ltd | Real estate | 2025 |
| JT Occupational Health Limited | Health & social care | 2019 |
| Jubilee Landscapes Limited | Administrative & support | 2016 |
| Juggal Ltd | Information & communication | 2024 |
| Jujipish Leisure Limited | Hospitality | 2006 |
| Jumaaih Ltd | Hospitality | 2025 |
| Jungle Hub Limited | Real estate | 2021 |
| Just Beautiful Kitchens Ltd | Wholesale & retail | 2024 |
| Just Busy Limited | Administrative & support | 2022 |
| Just Imagine Events Limited | Arts & recreation | 2020 |
| Just Recycle Ltd | Extraterritorial | 2020 |
| K & M Financial Advisors Limited | Financial services | 2004 |
| K DOODY1978 Ltd | Transport & logistics | 2025 |
| K Gill Engineering Limited | Professional & scientific | 2026 |
| K Properties (Rossendale) Holdings Limited | Financial services | 2006 |
| K Steels Holdings Limited | Financial services | 2006 |
| K-R Electrical Solutions Limited | Construction | 2018 |
| K.J. Ritson Limited | Construction | 2020 |
| K.J.Ritson&Son Limited | Administrative & support | 2013 |
| K3O Cafe Ltd | Hospitality | 2025 |
| Kadena Projects Limited | Professional & scientific | 2024 |
| Kaisocollective Ltd | Wholesale & retail | 2026 |
| Kane Developments (NW) Ltd | Construction | 2019 |
| Kaneki Ltd | Transport & logistics | 2025 |
| Karen Wright Photography Limited | Professional & scientific | 2003 |
| Kashmir Property Investments Limited | Real estate | 2021 |
| Katie Race Limited | Wholesale & retail | 2025 |
| Kay's Food RS Ltd | Hospitality | 2022 |
| Kcwi Ltd | Administrative & support | 2024 |
| Keico Living Ltd | Wholesale & retail | 2018 |
| Keico Outdoor Living Ltd | Construction | 2023 |
| Keico Property Ltd | Real estate | 2025 |
| Keir Lord Ltd | Wholesale & retail | 2026 |
| Kenmor Limited | Hospitality | 2009 |
| Kenross Containers Limited | Manufacturing | 1990 |
| Kestrel International Limited | Construction | 2022 |
| Kettlewell Holiday Cottages Ltd | Hospitality | 2022 |
| Key to Quality Limited | Information & communication | 2021 |
| KGR Rental Properties Limited | Real estate | 2021 |
| Kibs Estates Ltd | Real estate | 2022 |
| Kibs Fire & Security Ltd | Construction | 2025 |
| Kickstart Motors Ltd | Wholesale & retail | 2025 |
| Kilter Studio Ltd | Professional & scientific | 2021 |
| King Accountancy Services Limited | Professional & scientific | 2006 |
| Kingfisher Business Centres Limited | Real estate | 1990 |
| Kiran NW Ltd | Hospitality | 2024 |
| Kirklands Group Ltd | Construction | 2016 |
| Kitchen Trade Centre (EOT) Limited | Financial services | 2024 |
| Kitchen Trade Centre Limited | Wholesale & retail | 1985 |
| Kiwi Building + Maintenance Ltd | Construction | 2026 |
| KLM Plumbing & Heating (NW) Ltd | Construction | 2023 |
| KMO Property Investments Ltd | Real estate | 2023 |
| Kneeshaws Accountants Ltd | Extraterritorial | 2019 |
| Kneeshaws Ltd | Extraterritorial | 2019 |
| Knights Partnership Limited | Extraterritorial | 2023 |