| Komo Studio Ltd | Professional & scientific | 2025 |
| Kongwa Tech Ltd | Information & communication | 2026 |
| Konnectify Limited | Information & communication | 2021 |
| Kontrast Limited | Construction | 2010 |
| Kortan Management Ltd | Financial services | 2022 |
| Kosykids Limited | Manufacturing | 2025 |
| Kozi Resin Systems Ltd | Construction | 2014 |
| KPA Electrical Ltd | Construction | 2015 |
| KPL Ventures Ltd | Financial services | 2011 |
| Kraft Coaching Ltd | Arts & recreation | 2023 |
| Krantz Limited | Construction | 2017 |
| Kreation Laboratory Ltd | Manufacturing | 2004 |
| Krisi Transport Limited | Transport & logistics | 2014 |
| Krisis Limited | Professional & scientific | 2006 |
| Kristalily's Limited | Wholesale & retail | 2020 |
| KRV Ltd | Real estate | 2023 |
| KS Auto Recovery & Mechanics Ltd | Wholesale & retail | 2024 |
| KS Executive Virtual Services Limited | Wholesale & retail | 2021 |
| KS Lawton Properties Limited | Real estate | 2019 |
| KS Prime Holdings Ltd | Wholesale & retail | 2026 |
| KS Rochester Limited | Administrative & support | 2026 |
| KSB Homes Limited | Real estate | 2021 |
| KSH Logistics Limited | Transport & logistics | 2023 |
| KSP Partners Ltd | Wholesale & retail | 2016 |
| KSP Partners Properties Ltd | Real estate | 2025 |
| Ktec (Kent) Limited | Construction | 2021 |
| Ku-Tay Ltd | Wholesale & retail | 2018 |
| Kurtoglu Property Ltd | Real estate | 2025 |
| KW Automotive UK Limited | Wholesale & retail | 2005 |
| KW Studios Limited | Information & communication | 2021 |
| Kypreos Ltd | Construction | 2019 |
| K`S Cafe Limited | Hospitality | 2009 |
| L & E Harrison Ltd | Wholesale & retail | 2021 |
| L & G Property Solutions Ltd | Real estate | 2022 |
| L & M Services Limited | Transport & logistics | 1998 |
| L and L Homes Ltd | Real estate | 2022 |
| L and P Recovery Services Limited | Administrative & support | 2023 |
| L B Access Ltd | Construction | 2024 |
| L Banks Ltd | Construction | 2020 |
| L C Cleaning Services Ltd | Administrative & support | 2026 |
| L C Procarpentry Ltd | Construction | 2019 |
| L H Auto Services Ltd | Wholesale & retail | 2024 |
| L J Fisher Grab Hire Ltd | Transport & logistics | 2019 |
| L J Ward Services Ltd | Construction | 2007 |
| L M & P Homes Limited | Real estate | 2022 |
| L Robinson Services Ltd | Construction | 2024 |
| L Smiths Services Ltd | Construction | 2023 |
| L White Tree Services Ltd | Agriculture & fishing | 2020 |
| L&A Building Services Limited | Construction | 2014 |
| L&C Gosha Ltd | Professional & scientific | 2026 |
| L&J Apartment Ltd | Real estate | 2024 |
| L&M Properties Rochester Limited | Real estate | 2024 |
| L'Belia Ltd | Other services | 2024 |
| L. Griffith Brickwork Ltd | Construction | 2017 |
| L.A.D Construct&Build Limited | Construction | 2025 |
| L.F. Gardens Ltd | Administrative & support | 2020 |
| L.Hill Diamond Drilling Services Ltd | Construction | 2022 |
| LA Tankers Ltd | Professional & scientific | 2025 |
| Labrinth Retail Ltd | Administrative & support | 2018 |
| Lads Investments Limited | Financial services | 2025 |
| Ladybird Hub CIC | Hospitality | 2025 |
| LAE Property Ventures Ltd | Real estate | 2024 |
| Lakecrest Management Limited | Professional & scientific | 2016 |
| Lakeside Motors (Kent) Ltd | Extraterritorial | 2011 |
| Lakhi Beauty Treatments Ltd | Other services | 2023 |
| LAL Spice Limited | Hospitality | 2017 |
| Lally Limited | Health & social care | 2008 |
| Lamar Smith-Williams Ltd | Professional & scientific | 2022 |
| Lambert Heating Services Ltd | Energy | 2020 |
| Lamorbey Limited | Construction | 2021 |
| Lamorbey Properties Ltd | Real estate | 2025 |
| Lancaster Finance Limited | Administrative & support | 2010 |
| Lancelot Property Services Ltd | Construction | 2010 |
| Lancroft Limited | Construction | 2006 |
| Land & Sea UXO Services Limited | Construction | 2023 |
| Land Density UK Limited | Real estate | 2018 |
| Landlordio Limited | Real estate | 2025 |
| Landmark Kebab Ltd | Hospitality | 2022 |
| Landmark Learning Group Ltd | Administrative & support | 2025 |
| Landosmet Ltd | Real estate | 2025 |
| Landscape Management Company Limited | Households | 2023 |
| Landway Surfacing Ltd | Construction | 2004 |
| Lane Clothing Ltd | Wholesale & retail | 2026 |
| Lanjal Limited | Administrative & support | 2025 |
| Lapping Access Solutions Ltd | Construction | 2026 |
| Laranff Limited | Health & social care | 2016 |
| Lark Building Services Ltd | Construction | 2020 |
| Laser Quay Industrial Management Limited | Real estate | 1988 |
| Laser Quay Management Ltd | Real estate | 2024 |
| Laserchrom Hplc Laboratories Ltd | Professional & scientific | 1995 |
| Lashes by BOO Ltd | Other services | 2025 |
| Lashes by Sade Truelove Ltd | Other services | 2023 |
| Lashogg Ltd | Information & communication | 2016 |
| LAT Enterprises C.I.C. | Education | 1991 |
| Lateef Medicals Limited | Health & social care | 2020 |
| Latif Impex Ltd | Extraterritorial | 2014 |
| Launch PAD Marketing Ltd | Administrative & support | 2014 |
| Laura EVE Ltd | Health & social care | 2025 |
| Laura Vieceli Photography Ltd | Professional & scientific | 2021 |
| Lavender Health Limited | Health & social care | 2023 |