| Krispol Ltd | Transport & logistics | 2017 |
| Krownkleans Limited | Administrative & support | 2023 |
| Krungi Limited | Health & social care | 2014 |
| Kryczek Ltd | Transport & logistics | 2010 |
| Krystal Beauty Limited | Other services | 2025 |
| Krystal Peak UK Ltd | Real estate | 2023 |
| Krzysztof Gumny Limited | Transport & logistics | 2021 |
| KS Group & Sons Limited | Wholesale & retail | 2026 |
| KS SAI Property Ltd | Real estate | 2020 |
| KS Special Projects Limited | Professional & scientific | 2012 |
| Ksfvision Ltd | Information & communication | 2016 |
| KSG Pharma Ltd | Professional & scientific | 2021 |
| KSP IT Solutions Ltd | Information & communication | 2021 |
| KTM Global Ltd | Professional & scientific | 2024 |
| Kubus Rugby Ltd | Wholesale & retail | 2019 |
| Kubutek Trans Ltd | Transport & logistics | 2016 |
| Kuka Enterprise Limited | Professional & scientific | 2026 |
| Kulak Trans Limited | Transport & logistics | 2014 |
| Kulej Logistics Ltd | Transport & logistics | 2017 |
| Kulturezoo Kids Ltd | Wholesale & retail | 2021 |
| Kulturezoo Ltd | Wholesale & retail | 2017 |
| Kumho Tyre (U.K.) Limited | Wholesale & retail | 1977 |
| Kumorek Ltd | Transport & logistics | 2014 |
| Kunman Holdings Limited | Financial services | 2013 |
| Kuntze Instruments Limited | Professional & scientific | 2005 |
| Kusal Limited | Manufacturing | 2025 |
| Kush Consultancy Ltd | Information & communication | 2017 |
| Kushi Media Limited | Information & communication | 2009 |
| Kusi B Enterprise Limited | Wholesale & retail | 2021 |
| Kvant Lasers UK Limited | Arts & recreation | 2018 |
| KVM Heating & Plumbing Ltd | Construction | 2023 |
| KVR Homes Ltd | Real estate | 2025 |
| KWH Elec Ltd | Construction | 2022 |
| Kwik Taxi Rugby Ltd | Transport & logistics | 2022 |
| KWV Aesthetics Ltd | Other services | 2024 |
| Kylii Kids UK Ltd | Information & communication | 2011 |
| Kyroo Ltd | Construction | 2025 |
| Kysy Transport Ltd | Transport & logistics | 2022 |
| L & C Coach Works Limited | Wholesale & retail | 2008 |
| L and Co Tanning Limited | Other services | 2024 |
| L C G Claudiu Limited | Transport & logistics | 2017 |
| L Cranham Limited | Education | 2025 |
| L M H Bars Limited | Hospitality | 2022 |
| L R Hart Limited | Hospitality | 2017 |
| L R Hart Properties Ltd | Real estate | 2024 |
| L&A Cars Ltd | Wholesale & retail | 2025 |
| L&Bps Ltd | Administrative & support | 2021 |
| L&P Strzelec Ltd | Financial services | 2015 |
| L.E.M.P Ltd | Manufacturing | 2022 |
| L.K.Garage Ltd | Wholesale & retail | 2025 |
| LA Belle Aesthetics Ltd | Health & social care | 2022 |
| LA Oltenia Ltd | Wholesale & retail | 2025 |
| LA Pastaia Ltd | Hospitality | 2016 |
| LA Petite Beautique Ltd | Other services | 2016 |
| LAB Trade Ltd | Transport & logistics | 2016 |
| Laceys Accountants Limited | Professional & scientific | 2012 |
| Laceys Advisory Limited | Professional & scientific | 2014 |
| Laci 2 Ltd | Transport & logistics | 2025 |
| Lacny Limited | Real estate | 2025 |
| Ladolcevita 2026 Limited | Hospitality | 2026 |
| LAF Midlands UK Ltd | Manufacturing | 2016 |
| Laff's Wood Fired Pizza Company Ltd | Hospitality | 2021 |
| Lakshmi Solutions Limited | Professional & scientific | 2015 |
| Lakshmi Vihas Solutions Ltd | Information & communication | 2013 |
| Laliram Ltd | Wholesale & retail | 2013 |
| Lalogali Limited | Wholesale & retail | 2025 |
| Lamanlemuels Ltd | Wholesale & retail | 2019 |
| Lambda Abodes Limited | Health & social care | 2025 |
| Lancaster House Management Company (Leamington Spa) Limited | Real estate | 1996 |
| Land Recovery North West (Arden) Ltd | Water & waste | 2003 |
| Land Recovery North West Ltd | Water & waste | 1983 |
| Land Stability Consultant Ltd | Professional & scientific | 2024 |
| Landmark Surveys & Developments Ltd | Professional & scientific | 2014 |
| Lanerol Haulage Ltd | Transport & logistics | 2018 |
| Lang-Met Distillers Limited | Professional & scientific | 1986 |
| Langley Distillery Limited | Professional & scientific | 1985 |
| Lankowski Ltd | Transport & logistics | 2024 |
| Lark Rise Investment Solutions Limited | Financial services | 2024 |
| Larkin Builders Limited | Construction | 2014 |
| Laselo & Sons Limited | Transport & logistics | 2018 |
| Laser IT Limited | Manufacturing | 1993 |
| Laser Leisure Limited | Hospitality | 1983 |
| Laser Process Limited | Manufacturing | 1991 |
| Lash Box Shop Limited | Wholesale & retail | 2024 |
| Lasmux Devices Ltd | Manufacturing | 2024 |
| Lasurtex Limited | Professional & scientific | 2023 |
| Lateral 232 Ltd | Professional & scientific | 2025 |
| Latif Medics Limited | Health & social care | 2015 |
| Lauer Ltd | Transport & logistics | 2020 |
| Laughing Dog Construction Limited | Construction | 2010 |
| Laughing Dog Engineering Services Limited | Administrative & support | 2013 |
| Lauk Lighting Limited | Wholesale & retail | 1996 |
| LAV Energy Surveyor Services Ltd | Construction | 2024 |
| Lavender Lane Bridal Ltd | Wholesale & retail | 2020 |
| Lavetsi Ltd | Wholesale & retail | 2022 |
| Lawford (Rugby) Management Company Limited | Households | 2007 |
| Lawford Barbers Ltd | Other services | 2025 |
| Lawford Bespoke Joinery Ltd | Manufacturing | 2026 |
| Lawford Cleaning Ltd | Administrative & support | 2025 |
| Lawford GAS Services Ltd | Construction | 2026 |