| Krupali Limited | Real estate | 2025 |
| Krupsfood Ltd | Hospitality | 2026 |
| Kruti Beauty Limited | Other services | 2025 |
| Krystle Investments Limited | Real estate | 2018 |
| Krzzz Ltd | Wholesale & retail | 2023 |
| KS Chicken Limited | Hospitality | 2026 |
| KS8 Limited | Health & social care | 2015 |
| KSD Brand Ltd | Wholesale & retail | 2025 |
| KSP Building Services Ltd | Financial services | 2025 |
| Ksvconstruction Ltd | Construction | 2023 |
| KSX Films Ltd | Information & communication | 2015 |
| KT97 Ltd | Transport & logistics | 2019 |
| Ktam Ltd | Wholesale & retail | 2023 |
| KTC Investments Ltd | Real estate | 2024 |
| KTY Collection Limited | Wholesale & retail | 2023 |
| Kubach & Sambrook (Metals) Limited | Manufacturing | 1973 |
| Kuboaa Productions Limited | Information & communication | 2025 |
| Kudos Mortgages Ltd | Financial services | 2019 |
| Kukybakes Ltd | Hospitality | 2020 |
| Kumari Limited | Wholesale & retail | 2021 |
| Kumu Hospitality Ltd | Administrative & support | 2026 |
| Kundooz Property Management Ltd | Real estate | 2020 |
| Kunduz Supermarket Ltd | Wholesale & retail | 2025 |
| Kung FU Mama Ltd | Wholesale & retail | 2021 |
| Kurti Gallery Ltd | Wholesale & retail | 2021 |
| Kushani Limited | Real estate | 2016 |
| Kvkv Ltd | Health & social care | 2014 |
| KVL Property Ltd | Real estate | 2026 |
| Kvst Limited | Professional & scientific | 2017 |
| Kway GAS Services Ltd | Construction | 2024 |
| Kwikcost Commercial Limited | Professional & scientific | 2024 |
| Kwire Solutions Limited | Information & communication | 2011 |
| KWO Printing Needs (PVT) Ltd | Administrative & support | 2022 |
| KWS Engineering Analytics Ltd | Professional & scientific | 2019 |
| Kynar Design Ltd | Professional & scientific | 2022 |
| Kyne Construction Services Ltd | Construction | 2025 |
| Kyra Consulting Services Ltd | Other services | 2024 |
| Kyrutz Ltd | Transport & logistics | 2017 |
| Kyverdale Holdings Ltd | Administrative & support | 2024 |
| L & G Real Estate Limited | Real estate | 2019 |
| L & R Build Limited | Construction | 2016 |
| L a Motorsport Ltd | Extraterritorial | 2023 |
| L Barbu Ltd | Construction | 2014 |
| L J Music Limited | Administrative & support | 2003 |
| L&D Club Ltd | Construction | 2023 |
| L&P Acquisitions Ltd | Education | 2025 |
| L&S Coffee House Ltd | Hospitality | 2026 |
| L&V Decorating Ltd | Construction | 2015 |
| L'Atelier Photo Limited | Professional & scientific | 2021 |
| L-Ecom Ltd | Wholesale & retail | 2023 |
| L. Valenti Construction Ltd | Construction | 2016 |
| L.E. Associates Limited | Administrative & support | 2003 |
| L8ON Apps Limited | Administrative & support | 2014 |
| LA 40 Homes Limited | Real estate | 2023 |
| LA 40 Limited | Wholesale & retail | 2022 |
| LA Delicious Ltd | Hospitality | 2023 |
| LA Farine Ltd | Manufacturing | 2024 |
| LA Gaffe Limited | Hospitality | 2025 |
| LA Mamy Construction Ltd | Construction | 2017 |
| LA VIE Studio London Limited | Professional & scientific | 2019 |
| La-Rekiah Limited | Health & social care | 2023 |
| LAB on Demand Ltd | Professional & scientific | 2025 |
| LAC UK Construction Ltd | Construction | 2026 |
| LAC Viet Kitchen Limited | Hospitality | 2025 |
| Lachman Smith Associates Limited | Professional & scientific | 2011 |
| Ladah Inc Ltd | Information & communication | 2025 |
| Lahore Tika Masala (London) Limited | Hospitality | 2019 |
| Laila Bazaar Ltd | Wholesale & retail | 2025 |
| Laila Salehzehi Charitable Foundation | Education | 2008 |
| Laindon Motoring Centre Limited | Wholesale & retail | 2019 |
| Laiorga Global Ltd | Transport & logistics | 2025 |
| LAK Brothers Ltd | Wholesale & retail | 2019 |
| Laken Properties Limited | Extraterritorial | 2004 |
| Lakhani & Sons Limited | Wholesale & retail | 2023 |
| Lalli Brothers Limited | Wholesale & retail | 2021 |
| Lamberton Property Ltd | Real estate | 1954 |
| Lambeth Children's Theatre Company Limited | Arts & recreation | 1983 |
| Lamedait Ltd | Information & communication | 2019 |
| Lamedait Services Limited | Information & communication | 2019 |
| Lamiya Mammadova HR Consulting Ltd | Professional & scientific | 2019 |
| Lamna Financial Limited | Financial services | 2022 |
| Lanagold Limited | Professional & scientific | 2006 |
| Lanber Nursing Homes LLP | | 2008 |
| Lanber Properties LLP | | 2008 |
| Lanc Investments Ltd | Real estate | 2023 |
| Lancaster Gate Limited | Real estate | 2003 |
| Lancaster Gate N1 (Hendon) Management Company Limited | Households | 1991 |
| Lancelot Consultants Ltd | Information & communication | 2025 |
| Lancelot Trading Ltd | Wholesale & retail | 2010 |
| Landi Builders Ltd | Construction | 2017 |
| Landprime Limited | Real estate | 2014 |
| Landregal Docklands Ltd | Professional & scientific | 2008 |
| Landregal Estates Limited | Real estate | 2007 |
| Landscaping & Paving Ltd | Construction | 2020 |
| Landworth IT Ltd | Information & communication | 2018 |
| Lanesra Edgware Leasehold Limited | Real estate | 2026 |
| Lanesra Edgware Limited | Construction | 2021 |
| Lanka Best Ltd | Administrative & support | 2017 |
| Lanyx Ltd | Administrative & support | 2017 |
| Lapmere Limited | Professional & scientific | 2025 |