| Jessicamillie Ltd | Information & communication | 2023 |
| JFE Engineering Ltd | Professional & scientific | 2026 |
| JH Fulfilment Limited | Transport & logistics | 2012 |
| Jhic Electrical Ltd | Construction | 2025 |
| JJH Contractors Roofing & Building Ltd | Construction | 2026 |
| JM Surfacing and Paving Ltd | Construction | 2020 |
| John Anthony Wallace Limited | Extraterritorial | 2025 |
| John Edmondson (CAM Training & Support) Ltd | Professional & scientific | 2016 |
| John Hartley Associates Limited | Professional & scientific | 2003 |
| John Varley Ltd | Information & communication | 2008 |
| Jones Bespoke Homes Ltd | Construction | 2022 |
| Jordan Mulvaney Projects Ltd | Professional & scientific | 2024 |
| JPA Training Ltd | Other services | 2025 |
| Jr-Fitted Perfection Ltd | Construction | 2024 |
| JRC Roofing Distributors Limited | Wholesale & retail | 2000 |
| Julie Pawson Aesthetics Limited | Other services | 2014 |
| Jura Products Limited | Wholesale & retail | 2007 |
| K D Mellor Projects Ltd | Construction | 2025 |
| K Mouldings Ltd | Manufacturing | 2014 |
| K W Mortgage Services Limited | Financial services | 2005 |
| K.Cuprys Limited | Hospitality | 2016 |
| K1D2 Ltd | Wholesale & retail | 2025 |
| Kaizient Limited | Professional & scientific | 2025 |
| Kamazpl Limited | Wholesale & retail | 2020 |
| Karimi Enterprises Ltd | Health & social care | 2014 |
| Kawa Construction Limited | Construction | 2020 |
| Kaya Media Ltd | Information & communication | 2012 |
| Kelan Limited | Manufacturing | 1990 |
| Kelbrook Cafe Ltd | Hospitality | 2018 |
| Kellshott Properties Ltd | Real estate | 2024 |
| Kernow Property & Land Limited | Real estate | 2018 |
| Kevin GUY Plant Ltd | Administrative & support | 2007 |
| Khan Property Maintenance Ltd | Real estate | 2023 |
| Kilblaze Limited | Other services | 2006 |
| Kimberley Developments (Pendle) Ltd | Construction | 2016 |
| Kings Transport Limited | Transport & logistics | 2016 |
| Kirkway Properties Limited | Real estate | 2025 |
| Kirsten Bracewell PMU Ltd | Other services | 2025 |
| KJW Digital Ltd | Information & communication | 2022 |
| Knotts Lane Conve Store (Colne) Ltd | Wholesale & retail | 2023 |
| Knotts Lane Convenience Store Ltd | Wholesale & retail | 2014 |
| Knotts Lane Mini Mart Ltd | Wholesale & retail | 2018 |
| Kpow Group Limited | Wholesale & retail | 2024 |
| La-Z-Boy Manufacturing UK Limited | Manufacturing | 1999 |
| Laithmore Ltd | Administrative & support | 2022 |
| Lancashire Domiciliary Care Ltd | Health & social care | 2024 |
| Lancashire Housing Ltd | Real estate | 2021 |
| Langroyd Laundrette Limited | Other services | 2017 |
| Lanlee Holdings Limited | Wholesale & retail | 2020 |
| Lanlee Supplies Limited | Wholesale & retail | 1995 |
| Lanyor Bookkeeping and Accounts Ltd | Professional & scientific | 2020 |
| Laurence and the Machine Ltd | Manufacturing | 2022 |
| LBS Horticulture Limited | Wholesale & retail | 2018 |
| LBS Worldwide Limited | Wholesale & retail | 1994 |
| LDS Capital Limited | Financial services | 2026 |
| Ledger Lens Ltd | Information & communication | 2025 |
| Legacy Property Investors Limited | Real estate | 2019 |
| Legacy Venture Capital Ltd | Construction | 2024 |
| Leila Neve Fitness Ltd | Health & social care | 2022 |
| LHR Limited | Agriculture & fishing | 2020 |
| Liberty Vocals Ltd | Arts & recreation | 2012 |
| Libra Textiles Group Limited | Financial services | 2026 |
| Libra Textiles Holdings Limited | Financial services | 2021 |
| Libra Textiles Limited | Wholesale & retail | 1971 |
| Lift Group Holdings Ltd. | Financial services | 2016 |
| Lincoln Market Solutions Limited | Administrative & support | 2011 |
| Lincoln Properties (UK) Limited | Real estate | 2014 |
| Linden House Colne Ltd | Real estate | 2020 |
| Linton Regeneration Company Limited | Administrative & support | 2004 |
| Little Buttercups of Trawden Ltd | Health & social care | 2017 |
| Little Islands Limited | Other services | 2019 |
| Little Italy - Truly Authentic Ltd | Manufacturing | 2024 |
| Livgen QS Services Ltd | Professional & scientific | 2025 |
| LIW Properties Limited | Construction | 2017 |
| LIW Renovations Limited | Construction | 2017 |
| LJ Financial Planning (AJT) Limited | Financial services | 2015 |
| LJ Pregnancy Co Ltd | Health & social care | 2018 |
| LK Building & Roofing Limited | Construction | 2025 |
| LMB Brooke Holding Limited | Financial services | 2023 |
| LMB Medical Services Limited | Health & social care | 2022 |
| Local Shop Colne Limited | Wholesale & retail | 2019 |
| Locke Business Consulting Limited | Professional & scientific | 2017 |
| Lofty Cards Ltd | Wholesale & retail | 2023 |
| Longinson Pubs Ltd | Hospitality | 2024 |
| Love Gardening Limited | Wholesale & retail | 2020 |
| Lowood Estates Limited | Construction | 2020 |
| Loxie Ltd | Health & social care | 2022 |
| Lunney Properties Limited | Real estate | 2019 |
| Luxe.Art Global Ltd | Other services | 2019 |
| M and S Joiners Limited | Construction | 1997 |
| M D Developments North West Limited | Real estate | 2017 |
| M J Maybury Ltd | Agriculture & fishing | 2022 |
| M R Joinery & Restoration Ltd | Construction | 2020 |
| M&A Entertainment Ltd | Hospitality | 2020 |
| M.J. Ellis & SON Limited | Wholesale & retail | 2003 |
| M.S. Engineering (UK) Ltd | Construction | 2003 |
| M4RGN Ltd | Information & communication | 2024 |
| M65 GAS Training and Assessment Services Ltd | Education | 2005 |
| Machine Express Northwest Limited | Wholesale & retail | 2025 |
| Maddison Property Developments Limited | Construction | 2020 |