| John Bracewell & Sons Limited | Transport & logistics | 1938 |
| John Shaw Enterprise Ltd | Wholesale & retail | 2025 |
| Johns Care Services Ltd | Administrative & support | 2019 |
| Johnson & Brown Ltd | Hospitality | 2023 |
| Jones & Bancroft Holdings Limited | Real estate | 2023 |
| Jones Sales and Lettings Limited | Real estate | 2025 |
| Joshua Grimshaw Limited | Construction | 1946 |
| JP Brandwood Limited | Real estate | 2021 |
| JP Lettings NW Ltd | Real estate | 2023 |
| JPD Roofing Ltd | Construction | 2022 |
| JPT Property Services Ltd | Real estate | 2025 |
| JS Noir Ltd | Wholesale & retail | 2026 |
| JSD Electrical Engineering Ltd | Construction | 2025 |
| Jseb Limited | Real estate | 2021 |
| JSH Law Ltd | Professional & scientific | 2025 |
| JSY Technologies Ltd | Information & communication | 2026 |
| JTC Carpentry and Kitchens Ltd | Construction | 2018 |
| Juba Lawal Limited | Real estate | 2026 |
| Jugnoo Cloth House Ltd | Wholesale & retail | 2023 |
| Junction 7 Motor Village Ltd | Wholesale & retail | 2026 |
| Just Drinks (NW) Ltd | Wholesale & retail | 2021 |
| Just Switched Limited | Hospitality | 2021 |
| JW Couriers Ltd | Transport & logistics | 2026 |
| JWJ Occupational Health Limited | Health & social care | 2013 |
| JWR. Ltd | Extraterritorial | 2024 |
| K & M Home Building Renovations Ltd | Construction | 2024 |
| K & S Services Limited | Other services | 2002 |
| K C L Truck and Trailer Parts Limited | Wholesale & retail | 1998 |
| K Cars Private Hire Limited | Transport & logistics | 2018 |
| KAB Plumbing and Heating Ltd | Construction | 2020 |
| Kahn Delivery Ltd | Transport & logistics | 2022 |
| KAJ Property and Development Ltd | Households | 2022 |
| Kammy's Pizza Ltd | Hospitality | 2014 |
| Karma Minds Training & Personal Development Ltd | Other services | 2021 |
| Kash Properties (North West) Ltd | Real estate | 2023 |
| Kayhan 2026 Limited | Hospitality | 2026 |
| Kazam Enterprises Ltd | Wholesale & retail | 2025 |
| KB Darwen Ltd | Hospitality | 2025 |
| KB Service & Maintenance Ltd | Other services | 2023 |
| KC Contract Packers Ltd | Manufacturing | 2024 |
| KC Headquarters Limited | Manufacturing | 2017 |
| KC Management Blackburn Ltd | Administrative & support | 2024 |
| KCL (Industries) Limited | Real estate | 2004 |
| KCL Holdings Limited | Financial services | 2022 |
| Keenans Estate Agents Limited | Real estate | 2010 |
| Keenans Group Limited | Financial services | 2017 |
| Keenans Lettings Ltd | Other services | 2015 |
| Kelvs UK Ltd | Real estate | 2021 |
| Kennedy Horizons Ltd | Real estate | 2020 |
| Keynest Property Group Ltd | Real estate | 2026 |
| Keystocut Ltd | Wholesale & retail | 2026 |
| Khadir Consultancy Ltd | Information & communication | 2022 |
| Khalid Projects Ltd | Professional & scientific | 2023 |
| Khan Brothers Wholesale Halal Meat Limited | Wholesale & retail | 2007 |
| Khushiyaan Events Ltd | Administrative & support | 2026 |
| KIM Morley Ltd | Hospitality | 2025 |
| Kinas Consulting Ltd | Health & social care | 2023 |
| KJP Property Ltd | Construction | 2026 |
| KK Furniture Ltd | Wholesale & retail | 2024 |
| KKS55 Limited | Wholesale & retail | 2024 |
| KL Kleanz Limited | Other services | 2013 |
| Kmec Education Ltd. | Education | 2017 |
| Knights (Rosettes & Badges) Limited | Manufacturing | 1997 |
| Knuzden Bestone Ltd | Wholesale & retail | 2016 |
| Knuzden Estates Limited | Real estate | 2024 |
| Kokoro Promotions Limited | Arts & recreation | 2010 |
| Kollao Ltd | Administrative & support | 2025 |
| Kombi Kamp Ltd | Manufacturing | 2014 |
| Komfikamp Limited | Manufacturing | 2024 |
| Koselig Acres Limited | Real estate | 2024 |
| Kousar Locum Ltd | Public administration | 2023 |
| KPK Foods Ltd | Wholesale & retail | 2026 |
| KPK Meats Ltd | Wholesale & retail | 2022 |
| KRL Ltd | Wholesale & retail | 2015 |
| KRS Construction NW Ltd | Construction | 2020 |
| KSJ Consultancy (North West) Ltd | Health & social care | 2016 |
| KSJ Green Parrot Enterprise Limited | Wholesale & retail | 2025 |
| KTK Health Care Limited | Wholesale & retail | 2010 |
| L O Communications (North West) Ltd | Information & communication | 2016 |
| L W Motors 14 Ltd | Wholesale & retail | 2019 |
| L&L Property Rentals Ltd | Real estate | 2025 |
| L. Champ Funeral Services Limited | Other services | 1985 |
| L.E. Detailing Limited | Wholesale & retail | 2022 |
| L.M.Ents Limited | Education | 2021 |
| L3 Digital Ltd | Information & communication | 2020 |
| L33.4S.NW.LTD Limited | Administrative & support | 2021 |
| L4S.NW Limited | Administrative & support | 2019 |
| Labourrus Ltd | Construction | 2026 |
| Lacey French Online Coaching Ltd | Other services | 2023 |
| Lala's Takeaway Ltd | Hospitality | 2021 |
| Lancashire Canine Academy Ltd | Other services | 2023 |
| Lancashire Careers Company CIC | Professional & scientific | 2023 |
| Lancashire Cctv Ltd | Construction | 2025 |
| Lancashire Property Investments Ltd | Real estate | 2022 |
| Lancashire Travel Solutions Ltd | Transport & logistics | 2025 |
| Lancashire United Group | Education | 2025 |
| Lancashire Women | Professional & scientific | 2003 |
| Lancashire Work Based Executive Forum | Education | 2006 |
| Lancashires NO1 Minibus Hire Ltd | Administrative & support | 2024 |
| Lancastrian Commercial Properties Ltd | Real estate | 2018 |