| Kinsellatax 2014 Limited | Professional & scientific | 2014 |
| Kirk Estate Group Limited | Real estate | 2024 |
| Kirsa Solar Limited | Construction | 2011 |
| Kismet Assets Limited | Real estate | 2019 |
| Kitchen and Bath Roomers Limited | Wholesale & retail | 2000 |
| Kitout Conversions Limited | Wholesale & retail | 2023 |
| KK Sports Design Ltd | Professional & scientific | 2017 |
| KL Shipping Solutions Ltd | Transport & logistics | 2024 |
| Klas Homes & Lettings Limited | Real estate | 2017 |
| KLR Property Limited | Real estate | 2021 |
| Kluba Jackman Designs Limited | Professional & scientific | 2004 |
| KMC Services Ltd | Construction | 2024 |
| KMR Psychology Limited | Education | 2025 |
| KMY Creative Ltd | Information & communication | 2025 |
| KN Motor Repairs Limited | Wholesale & retail | 2019 |
| Knight Pyatt Ltd | Professional & scientific | 2009 |
| Knightsbridge Ftcp Limited | Financial services | 2021 |
| Know WE CAN DO That LLP | | 2021 |
| Knowles Computer Services Limited | Information & communication | 1996 |
| Knowles Family Holdings Limited | Financial services | 2022 |
| Knowles Green Ltd | Wholesale & retail | 2022 |
| Knowles Systems Limited | Administrative & support | 2024 |
| Knowles View MAN Co Limited | Households | 2023 |
| Knutty Clearance Ltd | Transport & logistics | 2026 |
| Knutty MAN & Van Ltd | Transport & logistics | 2026 |
| Knutty Movers Ltd | Transport & logistics | 2024 |
| Knutty Packaging Ltd | Administrative & support | 2026 |
| Knutty Storage Ltd | Transport & logistics | 2026 |
| Koded Web Ltd | Information & communication | 2018 |
| Kolekta Limited | Professional & scientific | 2013 |
| Kornit Digital/Kornitx Limited | Information & communication | 2010 |
| Koru North Limited | Financial services | 2026 |
| Kotto Limited | Wholesale & retail | 2026 |
| KPN Consultancy Limited | Professional & scientific | 2023 |
| Kraken Services/Solutions Ltd | Professional & scientific | 2024 |
| KS Lucey Limited | Hospitality | 2023 |
| Kubes Garden Rooms Ltd | Manufacturing | 2019 |
| Kudu Events Limited | Administrative & support | 2019 |
| Kula Solutions Ltd | Information & communication | 2014 |
| Kuma Studio Ltd | Professional & scientific | 2024 |
| KVA Energy & Plant Ltd | Administrative & support | 2026 |
| L & C Holmes Agencies Ltd | Wholesale & retail | 2023 |
| L & T Properties North West Limited | Real estate | 2021 |
| L & W Holdings (Cheshire) Ltd | Real estate | 2021 |
| L and J Workwear Limited | Wholesale & retail | 2005 |
| L Gray Plumbing and Heating Ltd | Construction | 2021 |
| L S Express Group Limited | Professional & scientific | 2011 |
| L. Wainwright & SON Limited | Extraterritorial | 1987 |
| L.A.M Media Limited | Professional & scientific | 2026 |
| L.J. Kirkham Limited | | 1978 |
| LA Cantina Didsbury Limited | Hospitality | 2016 |
| Lacey’S Groundwork and Surfacing Ltd | Construction | 2024 |
| Lady Dinahs Online Ltd | Wholesale & retail | 2021 |
| Ladymoor Foods Limited | Wholesale & retail | 1996 |
| Lakes and Lune Valley Lettings Limited | Real estate | 2026 |
| Lakeview Contract Services Limited | Professional & scientific | 2010 |
| Lakeview Holiday Homes Ltd | Hospitality | 2021 |
| Lakeview Training Limited | Professional & scientific | 2003 |
| Lakìn Brand Ltd | Wholesale & retail | 2024 |
| Lalithaa Ltd | Professional & scientific | 2018 |
| Lamatechnology Group Ltd | Information & communication | 2021 |
| Lamatechnology Ltd | Financial services | 2021 |
| Lamnidae Limited | Professional & scientific | 2025 |
| Lancaster Aero Services Limited | Other services | 2012 |
| Lancaster-Towers Associates Ltd | Professional & scientific | 2024 |
| Land & Investments Four Limited | Extraterritorial | 2012 |
| Land & Investments One Limited | Real estate | 1999 |
| Land & Investments Three Limited | Real estate | 2010 |
| Land & Investments Two Limited | Extraterritorial | 2009 |
| Land of Decor Ltd | Wholesale & retail | 2020 |
| Landed Garden Design Ltd | Administrative & support | 2020 |
| Landscaping Creation Ltd | Administrative & support | 2025 |
| Lane END (Property Management) Limited | Real estate | 1996 |
| Lane Resource Holdings Limited | Financial services | 2023 |
| Lansdale Properties Ltd | Real estate | 2004 |
| Lanset Medical Ltd | Manufacturing | 2013 |
| Lanto Design Ltd | Information & communication | 2025 |
| Lanvale Limited | Professional & scientific | 2014 |
| Larchmoor Park Management Company Limited | Households | 1982 |
| Larchmoor Park Property Limited | Households | 1992 |
| Larkstone Furniture Ltd | Manufacturing | 2026 |
| Larkview Consulting Ltd | Professional & scientific | 2024 |
| Latimer Land Limited | Real estate | 2020 |
| Laturka Holdings Ltd | Hospitality | 2017 |
| Launch Scientific Limited | Health & social care | 2013 |
| Laura Hopkinson Holdings Limited | Financial services | 2026 |
| Laurel Lane Limited | Wholesale & retail | 2021 |
| Lauren Elizabeth Harris Ltd | Professional & scientific | 2023 |
| Lavender Tree Interior Design Ltd | Professional & scientific | 2017 |
| Law Group Consulting Limited | Professional & scientific | 2020 |
| Law Group Investments Limited | Real estate | 2019 |
| Law Secure Limited | Administrative & support | 2015 |
| Lawmatix Limited | Professional & scientific | 2010 |
| Lawrie & Daughters Homes Limited | Hospitality | 2017 |
| Lawrie & Daughters Limited | Professional & scientific | 2014 |
| Lawrie & Daughters Properties Limited | Real estate | 2017 |
| Lawtalk Network Limited | Other services | 2003 |
| Lawton Mouthpieces Ltd | Professional & scientific | 2023 |
| LAY My HAT Limited | Real estate | 2026 |
| Layer and Soul Ltd | Manufacturing | 2024 |