| Keenan Able Ltd | Construction | 2024 |
| Keer Bridge Ltd. | Real estate | 1998 |
| Keer Valley Glamping Ltd | Hospitality | 2019 |
| Kegclub Ltd | Wholesale & retail | 2026 |
| Keggedup Ltd | Wholesale & retail | 2026 |
| Keith Dawson Auto Repairs Limited | Wholesale & retail | 2014 |
| Keldrigg Shutters and Grills Limited | Other services | 1996 |
| Kellet Court (Lancaster) Limited | Real estate | 1985 |
| Kels Construction Ltd | Construction | 2014 |
| Kendal House Freehold Limited | Households | 2021 |
| Kendal House Clinic Ltd | Health & social care | 2004 |
| Kendal Wills Limited | Professional & scientific | 2002 |
| Kenko Selects Limited | Hospitality | 2023 |
| Kennedyco Ltd | Information & communication | 2024 |
| Kentwone Sage Ltd | Wholesale & retail | 2022 |
| Kenzi Consultancy Ltd | Health & social care | 2021 |
| Kenzy Ltd | Health & social care | 2023 |
| KER Advisory Limited | Administrative & support | 2024 |
| Kesllyn Consulting Ltd | Professional & scientific | 2022 |
| Kevin Bishop Media Ltd | Manufacturing | 2015 |
| Kevin Distribution Limited | Information & communication | 2010 |
| Key Link Media Ltd | Manufacturing | 2022 |
| Key Skills Recruitment Limited | Administrative & support | 2014 |
| Keyline Security Ltd | Administrative & support | 2025 |
| Keystone Property Lets Ltd | Real estate | 2026 |
| Kfell Ltd | Manufacturing | 2015 |
| KFI U.K. Limited | Manufacturing | 2023 |
| Kg.Buildingandjoinery Ltd | Manufacturing | 2025 |
| Khan & Mahmood Trading Company Ltd | Wholesale & retail | 2017 |
| KHT Retail Ltd | Wholesale & retail | 2024 |
| Khvh Investments Ltd | Real estate | 2012 |
| Kiac Ltd | Hospitality | 2017 |
| Kidz GOT Talent Limited | Education | 2016 |
| Kieron Bassett Financial Services Limited | Financial services | 2020 |
| Kierons Kitchen Limited | Hospitality | 2023 |
| Kiggins Auto Repair Ltd | Wholesale & retail | 2022 |
| Killelay Consulting Ltd | Professional & scientific | 2015 |
| Kilnerfoot Developments Limited | Construction | 2005 |
| Kilnknowe Caravan Park Limited | Hospitality | 2005 |
| KIM Grocer Limited | Wholesale & retail | 2023 |
| Kinetic Danceworks Limited | Arts & recreation | 2026 |
| King Sound Studio Limited | Information & communication | 2019 |
| King Street Arts (Lancaster) CIC | Administrative & support | 2022 |
| Kings Academy of Performing Arts Ltd | Arts & recreation | 2020 |
| Kingsbridge Clinic Ltd | Health & social care | 2026 |
| Kirkby Contracting Limited | Agriculture & fishing | 2012 |
| Kirkby Lonsdale Properties Limited | Real estate | 2018 |
| Kirkstone 1960 Limited | Extraterritorial | 2013 |
| Kirkstone Foot Holiday Apartments Limited | Hospitality | 2014 |
| Kitchen Installations (North West) Limited | Construction | 2003 |
| KJ and MA Gardner Limited | Administrative & support | 2024 |
| KMP Webber Consulting Limited | Information & communication | 2007 |
| KMR Construction 2026 Ltd | Construction | 2026 |
| Knight Property Letting Ltd | Real estate | 2025 |
| Knight Training (UK) Limited | Administrative & support | 2011 |
| Kogen RYU Ltd | Education | 2022 |
| Kolos UA LLP | | 2025 |
| Korepave Limited | Construction | 2018 |
| Koru Property Solutions Ltd | Real estate | 2023 |
| KRV Foods Limited | Hospitality | 2025 |
| Ksfr Ltd | Professional & scientific | 2010 |
| KSM1 Ltd | Construction | 2018 |
| Kubon Limited | Energy | 2014 |
| Kullich Systems Ltd | Information & communication | 2009 |
| Kurd Cutz 8A Ltd | Other services | 2026 |
| Kurd Shawarma Ltd | Hospitality | 2025 |
| Kwik Market Limited | Wholesale & retail | 2023 |
| KWR Lancaster Holdings Limited | Financial services | 2025 |
| Kyniu Go Limited | Transport & logistics | 2025 |
| Kytek Ltd | Wholesale & retail | 2024 |
| L & N Properties LLP | | 2012 |
| L N Joinery (NW) Limited | Construction | 2012 |
| L N Properties (NW) Limited | Real estate | 2024 |
| L P Williams Limited | Wholesale & retail | 2011 |
| L Salisbury Properties Limited | Administrative & support | 2019 |
| L&M Top Living Ltd | Real estate | 2025 |
| L.U.S.U. Housing Limited | Real estate | 2010 |
| L.U.S.U. Services Company Limited | Hospitality | 1997 |
| LA AGB Ltd | Wholesale & retail | 2026 |
| LA One Stop Ltd | Wholesale & retail | 2026 |
| LA1 Construction Limited | Construction | 2014 |
| LA1 Heating & Renewables Limited | Construction | 2021 |
| LA1 Holdings Limited | Financial services | 2023 |
| LA1 Payroll Ltd | Financial services | 2025 |
| LAB Creative Limited | Information & communication | 2022 |
| LAB Testing Solutions Ltd | Manufacturing | 2015 |
| Laboratory Screening Services Limited | Health & social care | 1988 |
| Labyrinth Group Limited | Real estate | 2025 |
| Lago Nero Ltd | Wholesale & retail | 2023 |
| Lake District Exterior Cleaning Ltd | Administrative & support | 2022 |
| Lake District Lodges Ltd | Administrative & support | 2016 |
| Lake District Solar Limited | Construction | 2023 |
| Lake District Taxis Ltd | Transport & logistics | 2025 |
| Lakeland Audiology Limited | Wholesale & retail | 2023 |
| Lakeland Evaluation and Consulting Limited | Professional & scientific | 2003 |
| Lakeland Hills Childcare Consultancy Limited | Health & social care | 2025 |
| Lakeland Leisure Homes Limited | Construction | 2012 |
| Lakeland LPG Limited | Professional & scientific | 2002 |
| Lakeland Parks Ltd | Hospitality | 2025 |
| Lakeland Refurbishment Limited | Construction | 2010 |